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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2020	Apr. 28, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	1-13102
Entity Registrant Name	FIRST INDUSTRIAL REALTY TRUST, INC.
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	36-3935116
Entity Address, Address Line One	1 N. Wacker Drive, Suite 4200
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	312
Local Phone Number	344-4300
Title of 12(b) Security	Common Stock, par value $.01 per share
Trading Symbol	FR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000921825
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		127,207,645
First Industrial, L.P.
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Mar. 31, 2020
Entity File Number	333-21873
Entity Registrant Name	FIRST INDUSTRIAL, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3924586
Trading Symbol	FRFI
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001033128
Current Fiscal Year End Date	--12-31

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment in Real Estate:
Land	$ 1,060,358	$ 957,478
Buildings and Improvements	2,813,421	2,782,430
Construction in Progress	125,666	90,301
Less: Accumulated Depreciation	(813,345)	(804,780)
Net Investment in Real Estate	3,186,100	3,025,429
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $4,597 and $0	4,857	0
Operating Lease Right-of-Use Assets	25,854	24,877
Cash and Cash Equivalents	129,117	21,120
Restricted Cash	5,887	131,598
Tenant Accounts Receivable	7,876	8,529
Investment in Joint Venture	18,509	18,208
Deferred Rent Receivable	79,924	77,703
Deferred Leasing Intangibles, Net	27,760	28,533
Prepaid Expenses and Other Assets, Net	176,890	182,831
Total Assets	3,662,774	3,518,828
Indebtedness:
Mortgage Loans Payable, Net	172,510	173,685
Senior Unsecured Notes, Net	694,144	694,015
Unsecured Term Loans, Net	458,129	457,865
Unsecured Credit Facility	320,000	158,000
Accounts Payable, Accrued Expenses and Other Liabilities	103,212	114,637
Operating Lease Liabilities	23,370	22,369
Deferred Leasing Intangibles, Net	12,088	11,893
Rents Received in Advance and Security Deposits	55,483	57,534
Dividends and Distributions Payable	32,857	30,567
Total Liabilities	1,871,793	1,720,565
Commitments and Contingencies	0	0
First Industrial Realty Trust Inc.’s Stockholders’ Equity/First Industrial, L.P.'s Partners' Capital:
Common Stock ($0.01 par value, 225,000,000 shares authorized and 127,207,645 and 126,994,478 shares issued and outstanding)	1,272	1,270
Additional Paid-in-Capital	2,138,298	2,140,847
Distributions in Excess of Accumulated Earnings	(365,050)	(370,835)
Accumulated Other Comprehensive Loss	(21,054)	(6,883)
Total First Industrial Realty Trust, Inc.'s Stockholders' Equity	1,753,466	1,764,399
Noncontrolling Interest	37,515	33,864
Total Equity	1,790,981	1,798,263
Total Liabilities and Equity/Partners' Capital	3,662,774	3,518,828
First Industrial, L.P.
Investment in Real Estate:
Land	1,060,358	957,478
Buildings and Improvements	2,813,421	2,782,430
Construction in Progress	125,666	90,301
Less: Accumulated Depreciation	(813,345)	(804,780)
Net Investment in Real Estate	3,186,100	3,025,429
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $4,597 and $0	4,857	0
Operating Lease Right-of-Use Assets	25,854	24,877
Cash and Cash Equivalents	129,117	21,120
Restricted Cash	5,887	131,598
Tenant Accounts Receivable	7,876	8,529
Investment in Joint Venture	18,509	18,208
Deferred Rent Receivable	79,924	77,703
Deferred Leasing Intangibles, Net	27,760	28,533
Prepaid Expenses and Other Assets, Net	186,550	192,852
Total Assets	3,672,434	3,528,849
Indebtedness:
Mortgage Loans Payable, Net	172,510	173,685
Senior Unsecured Notes, Net	694,144	694,015
Unsecured Term Loans, Net	458,129	457,865
Unsecured Credit Facility	320,000	158,000
Accounts Payable, Accrued Expenses and Other Liabilities	103,212	114,637
Operating Lease Liabilities	23,370	22,369
Deferred Leasing Intangibles, Net	12,088	11,893
Rents Received in Advance and Security Deposits	55,483	57,534
Dividends and Distributions Payable	32,857	30,567
Total Liabilities	1,871,793	1,720,565
Commitments and Contingencies	0	0
First Industrial Realty Trust Inc.’s Stockholders’ Equity/First Industrial, L.P.'s Partners' Capital:
General Partner Units (127,207,645 and 126,994,478 units outstanding)	1,757,222	1,750,656
Limited Partners Units (2,706,760 and 2,422,744 units outstanding)	64,208	63,618
Accumulated Other Comprehensive Loss	(21,501)	(7,013)
Total First Industrial L.P.'s Partners' Capital	1,799,929	1,807,261
Noncontrolling Interest	712	1,023
Total Partners' Capital	1,800,641	1,808,284
Total Liabilities and Equity/Partners' Capital	$ 3,672,434	$ 3,528,849

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Real Estate and Other Assets Held for Sale, Accumulated Depreciation and Amortization	$ 4,597	$ 0
Net Investment in Real Estate	3,186,100	3,025,429
Mortgage Loans Payable, Net	$ 172,510	$ 173,685
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	225,000,000	225,000,000
Common Stock, shares issued	127,207,645	126,994,478
Common Stock, shares outstanding	127,207,645	126,994,478
First Industrial, L.P.
Real Estate and Other Assets Held for Sale, Accumulated Depreciation and Amortization	$ 4,597	$ 0
Net Investment in Real Estate	3,186,100	3,025,429
Mortgage Loans Payable, Net	$ 172,510	$ 173,685
General Partner Units, units outstanding	127,207,645	126,994,478
Limited Partner Units, units outstanding	2,706,760	2,422,744
Other Real Estate Partnerships
Net Investment in Real Estate	$ 242,214	$ 240,847
Mortgage Loans Payable, Net	$ 10,928	$ 11,009

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Lease Revenue	$ 108,375	$ 103,638
Other Revenue	1,968	903
Total Revenues	110,343	104,541
Expenses:
Property Expenses	29,081	30,168
General and Administrative	9,251	6,802
Depreciation and Other Amortization	30,931	30,055
Total Expenses	69,263	67,025
Other Income (Expense):
Gain (Loss) on Sale of Real Estate	13,993	(208)
Interest Expense	(12,804)	(12,767)
Amortization of Debt Issuance Costs	(788)	(831)
Total Other Income (Expense)	401	(13,806)
Income from Operations Before Equity in (Loss) Income of Joint Venture and Income Tax Benefit (Provision)	41,481	23,710
Equity in (Loss) Income of Joint Venture	(29)	844
Income Tax Benefit (Provision)	77	(214)
Net Income	41,529	24,340
Less: Net Income Attributable to the Noncontrolling Interest	(895)	(537)
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 40,634	$ 23,803
Basic and Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders / Unitholders	$ 0.32	$ 0.19
Weighted Average Shares/Units Outstanding - Basic	126,934	126,194
Weighted Average Shares/Units Outstanding - Diluted	127,111	126,456
First Industrial, L.P.
Revenues:
Lease Revenue	$ 108,375	$ 103,638
Other Revenue	1,968	903
Total Revenues	110,343	104,541
Expenses:
Property Expenses	29,081	30,168
General and Administrative	9,251	6,802
Depreciation and Other Amortization	30,931	30,055
Total Expenses	69,263	67,025
Other Income (Expense):
Gain (Loss) on Sale of Real Estate	13,993	(208)
Interest Expense	(12,804)	(12,767)
Amortization of Debt Issuance Costs	(788)	(831)
Total Other Income (Expense)	401	(13,806)
Income from Operations Before Equity in (Loss) Income of Joint Venture and Income Tax Benefit (Provision)	41,481	23,710
Equity in (Loss) Income of Joint Venture	(29)	844
Income Tax Benefit (Provision)	77	(214)
Net Income	41,529	24,340
Less: Net Income Attributable to the Noncontrolling Interest	(50)	(26)
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 41,479	$ 24,314
Basic and Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders / Unitholders	$ 0.32	$ 0.19
Weighted Average Shares/Units Outstanding - Basic	129,070	128,818
Weighted Average Shares/Units Outstanding - Diluted	129,400	129,178

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Income	$ 41,529	$ 24,340
Mark-to-Market Loss on Derivative Instruments	(14,590)	(6,354)
Amortization of Derivative Instruments	102	24
Comprehensive Income	27,041	18,010
Comprehensive Income Attributable to Noncontrolling Interest	(582)	(397)
Comprehensive Income Attributable to Common Stockholders / Unitholders	26,459	17,613
First Industrial, L.P.
Net Income	41,529	24,340
Mark-to-Market Loss on Derivative Instruments	(14,590)	(6,354)
Amortization of Derivative Instruments	102	24
Comprehensive Income	27,041	18,010
Comprehensive Income Attributable to Noncontrolling Interest	(50)	(26)
Comprehensive Income Attributable to Common Stockholders / Unitholders	$ 26,991	$ 17,984

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References + Details

- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY/ PARTNER'S CAPITAL - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in- Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interest	First Industrial, L.P.	First Industrial, L.P. General Partner Units	First Industrial, L.P. Limited Partner Units	First Industrial, L.P. Accumulated Other Comprehensive Loss	First Industrial, L.P. Noncontrolling Interest
Beginning Balance at Dec. 31, 2018	$ 1,679,911	$ 1,263	$ 2,131,556	$ (490,807)	$ 3,502	$ 34,397
Beginning Balance at Dec. 31, 2018							$ 1,690,019	$ 1,619,342	$ 66,246	$ 3,574	$ 857
Increase (Decrease) in Stockholders' Equity / Partners' Capital [Roll Forward]
Net Income	24,340			23,803		537	24,340	23,777	537		26
Other Comprehensive Loss	(6,330)				(6,190)	(140)	(6,330)			(6,330)
Stock Based Compensation Activity	(2,035)	2	(611)	(1,696)		270
Stock Based Compensation Activity							(2,035)	2,305	(270)
Common Stock Dividends and Unit Distributions	(29,922)			(29,258)		(664)
Unit Distributions							(29,922)	(29,258)	(664)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	0			0	0	0	0
Reallocation - Additional Paid-in-Capital	0		(3,238)			3,238
Reallocation - Other Comprehensive Income	0				(7)	7
Distributions to Noncontrolling Interest							(43)				(43)
Ending Balance at Mar. 31, 2019	1,665,964	1,265	2,127,707	(497,958)	(2,695)	37,645
Ending Balance at Mar. 31, 2019							1,676,029	1,611,556	66,389	(2,756)	840
Beginning Balance at Dec. 31, 2019	1,798,263	1,270	2,140,847	(370,835)	(6,883)	33,864
Beginning Balance at Dec. 31, 2019							1,808,284	1,750,656	63,618	(7,013)	1,023
Increase (Decrease) in Stockholders' Equity / Partners' Capital [Roll Forward]
Net Income	41,529			40,634		895	41,529	40,584	895		50
Other Comprehensive Loss	(14,488)				(14,175)	(313)	(14,488)			(14,488)
Stock Based Compensation Activity	(1,835)	0	(1,233)	(2,975)		2,373
Stock Based Compensation Activity							(1,835)	4,208	(2,373)
Common Stock Dividends and Unit Distributions	(32,488)			(31,874)		(614)
Unit Distributions							(32,488)	(31,874)	(614)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	2	2,062			(2,064)	0	2,064	(2,064)
Reallocation - Additional Paid-in-Capital	0		(3,378)			3,378
Reallocation - Other Comprehensive Income	0				4	(4)
Contributions from Noncontrolling Interest							5				5
Distributions to Noncontrolling Interest							(366)				(366)
Ending Balance at Mar. 31, 2020	$ 1,790,981	$ 1,272	$ 2,138,298	$ (365,050)	$ (21,054)	$ 37,515
Ending Balance at Mar. 31, 2020							$ 1,800,641	$ 1,757,222	$ 64,208	$ (21,501)	$ 712

CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY / PARTNERS' CAPITAL (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Dividends/Distributions Per Share/Unit	$ 0.25	$ 0.23
First Industrial, L.P.
Dividends/Distributions Per Share/Unit	$ 0.25	$ 0.23

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 41,529	$ 24,340
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	24,906	24,376
Amortization of Debt Issuance Costs	788	831
Other Amortization, including Stock Based Compensation	7,920	7,022
Equity in Loss (Income) of Joint Venture	29	(844)
Distributions from Joint Venture	0	568
(Gain) Loss on Sale of Real Estate	(13,993)	208
Straight-line Rental Income and Expense, Net	(2,898)	(2,690)
Increase in Tenant Accounts Receivable and Prepaid Expenses and Other Assets, Net	(4,452)	(6,390)
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(13,560)	(5,692)
Net Cash Provided by Operating Activities	40,269	41,729
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(142,380)	(18,499)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(55,813)	(43,402)
Net Proceeds from Sales of Investments in Real Estate	26,030	9,793
Contributions to and Investments in Joint Venture	(339)	0
Distributions from Joint Venture	0	2,175
Deposits on Future Acquisitions and Other Investing Activity	(10,550)	(7,048)
Net Cash Used in Investing Activities	(183,052)	(56,981)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax Paid on Shares Withheld	(5,944)	(4,384)
Common Stock Dividends and Unit Distributions Paid	(29,730)	(28,042)
Repayments on Mortgage Loans Payable	(1,257)	(73,806)
Proceeds from Unsecured Credit Facility	232,000	121,000
Repayments on Unsecured Credit Facility	(70,000)	(19,000)
Net Cash Provided by (Used in) Financing Activities	125,069	(4,232)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(17,714)	(19,484)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	152,718	50,373
Cash, Cash Equivalents and Restricted Cash, End of Period	135,004	30,889
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity	1,558	944
Cash Paid for Operating Lease Liabilities	727	268
Supplemental Schedule of Non-Cash Operating Activities:
Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets	1,208	12,400
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	32,857	30,139
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0
Assumption of Liabilities in Connection with the Acquisition of Real Estate	3,385	0
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	34,307	43,002
Write-off of Fully Depreciated Assets	(6,195)	(11,176)
Noncontrolling Interest
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	895	537
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(2,064)	0
Common Stock
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	2	0
Additional Paid-in- Capital
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	2,062	0
First Industrial, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	41,529	24,340
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	24,906	24,376
Amortization of Debt Issuance Costs	788	831
Other Amortization, including Stock Based Compensation	7,920	7,022
Equity in Loss (Income) of Joint Venture	29	(844)
Distributions from Joint Venture	0	568
(Gain) Loss on Sale of Real Estate	(13,993)	208
Straight-line Rental Income and Expense, Net	(2,898)	(2,690)
Increase in Tenant Accounts Receivable and Prepaid Expenses and Other Assets, Net	(4,091)	(6,347)
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(13,560)	(5,692)
Net Cash Provided by Operating Activities	40,630	41,772
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(142,380)	(18,499)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(55,813)	(43,402)
Net Proceeds from Sales of Investments in Real Estate	26,030	9,793
Contributions to and Investments in Joint Venture	(339)	0
Distributions from Joint Venture	0	2,175
Deposits on Future Acquisitions and Other Investing Activity	(10,550)	(7,048)
Net Cash Used in Investing Activities	(183,052)	(56,981)
CASH FLOWS FROM FINANCING ACTIVITIES:
Tax Paid on Shares Withheld	(5,944)	(4,384)
Common Stock Dividends and Unit Distributions Paid	(29,730)	(28,042)
Contributions from Noncontrolling Interests	5	0
Distributions to Noncontrolling Interests	(366)	(43)
Repayments on Mortgage Loans Payable	(1,257)	(73,806)
Proceeds from Unsecured Credit Facility	232,000	121,000
Repayments on Unsecured Credit Facility	(70,000)	(19,000)
Net Cash Provided by (Used in) Financing Activities	124,708	(4,275)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(17,714)	(19,484)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	152,718	50,373
Cash, Cash Equivalents and Restricted Cash, End of Period	135,004	30,889
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity	1,558	944
Cash Paid for Operating Lease Liabilities	727	268
Supplemental Schedule of Non-Cash Operating Activities:
Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets	1,208	12,400
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	32,857	30,139
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0
Assumption of Liabilities in Connection with the Acquisition of Real Estate	3,385	0
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	34,307	43,002
Write-off of Fully Depreciated Assets	(6,195)	(11,176)
First Industrial, L.P. \| Limited Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	895	537
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(2,064)	0
First Industrial, L.P. \| General Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	40,584	23,777
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	$ 2,064	$ 0

Organization	3 Months Ended
Organization	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization First Industrial Realty Trust, Inc. (the "Company") is a self-administered and fully integrated real estate company which owns, manages, acquires, sells, develops and redevelops industrial real estate. The Company is a Maryland corporation organized on August 10, 1993 and a real estate investment trust ("REIT") as defined in the Internal Revenue Code of 1986 (the "Code"). Unless stated otherwise or the context otherwise requires, the terms "we," "our" and "us" refer to the Company and its subsidiaries, including its operating partnership, First Industrial, L.P. (the "Operating Partnership"), and its consolidated subsidiaries. We began operations on July 1, 1994. The Company's operations are conducted primarily through the Operating Partnership, of which the Company is the sole general partner (the "General Partner"), with an approximate 97.9% ownership interest ("General Partner Units") at March 31, 2020. The Operating Partnership also conducts operations through eight other limited partnerships (the "Other Real Estate Partnerships"), numerous limited liability companies ("LLCs") and certain taxable REIT subsidiaries ("TRSs"), the operating data of which, together with that of the Operating Partnership, is consolidated with that of the Company as presented herein. The Operating Partnership holds at least a 99% limited partnership interest in each of the Other Real Estate Partnerships. The general partners of the Other Real Estate Partnerships are separate corporations, wholly-owned by the Company, each with at least a .01% general partnership interest in the Other Real Estate Partnerships. The Company does not have any significant assets or liabilities other than its investment in the Operating Partnership and its 100% ownership interest in the general partners of the Other Real Estate Partnerships. The Company's noncontrolling interest in the Operating Partnership of approximately 2.1% at March 31, 2020 represents the aggregate partnership interest held by the limited partners thereof ("Limited Partner Units" and together with the General Partner Units, the "Units"). The limited partners of the Operating Partnership are persons or entities who contributed their direct or indirect interests in properties to the Operating Partnership in exchange for common Limited Partner Units of the Operating Partnership and/or recipients of RLP Units of the Operating Partnership (See Note 6) pursuant to the Company's stock incentive plan. We also own a 49% equity interest in, and provide various services to, a joint venture (the "Joint Venture") through a wholly- owned TRS of the Operating Partnership. The Joint Venture is accounted for under the equity method of accounting. The operating data of the Joint Venture is not consolidated with that of the Company or the Operating Partnership as presented herein. See Note 5 for more information related to the Joint Venture. Profits, losses and distributions of the Operating Partnership, the LLCs, the Other Real Estate Partnerships, the TRSs and the Joint Venture are allocated to the general partner and the limited partners, the members or the shareholders, as applicable, of such entities in accordance with the provisions contained within their respective organizational documents. As of March 31, 2020, we owned 436 industrial properties located in 21 states, containing an aggregate of approximately 62.6 million square feet of gross leasable area ("GLA"). Of the 436 properties owned on a consolidated basis, none of them are directly owned by the Company.

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the accounting policies described in the consolidated financial statements and related notes included in our annual report on Form 10-K for the year ended December 31, 2019 ("2019 Form 10-K") and should be read in conjunction with such consolidated financial statements and related notes. The 2019 year end consolidated balance sheet data included in this Form 10-Q filing was derived from the audited consolidated financial statements in our 2019 Form 10-K, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("GAAP"). The following notes to these interim consolidated financial statements highlight significant changes to the notes included in the December 31, 2019 audited consolidated financial statements included in our 2019 Form 10-K and present interim disclosures as required by the Securities and Exchange Commission. Reclassifications Certain amounts included in the Consolidated Financial Statements for 2019 have been reclassified to conform to the 2020 financial statement presentation. Use of Estimates In order to conform with GAAP, in preparation of our consolidated financial statements we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of March 31, 2020 and December 31, 2019, and the reported amounts of revenues and expenses for the three months ended March 31, 2020 and 2019. Actual results could differ from those estimates. In our opinion, the accompanying unaudited interim consolidated financial statements reflect all adjustments necessary for a fair statement of our financial position as of March 31, 2020 and December 31, 2019, the results of our operations and comprehensive income for each of the three months ended March 31, 2020 and 2019, and our cash flows for each of the three months ended March 31, 2020 and 2019. All adjustments are of a normal recurring nature.

Investment in Real Estate

3 Months Ended

Mar. 31, 2020

Real Estate [Abstract]

Investment in Real Estate

Acquisitions

During the three months ended March 31, 2020, we acquired four industrial properties comprised of approximately 0.8 million square feet of GLA and two land parcels. We accounted for the properties and land parcels as asset acquisitions and therefore capitalized transaction costs to the basis of the acquired assets. The following table summarizes the amounts recognized for each major asset class for the industrial properties and land parcels acquired during the three months ended March 31, 2020:



Land	$	83,511
Building and Improvements/Construction in Progress	56,048
In-Place Leases	981
Above Market Leases	134
Below Market Leases	(770		)
Other Assets (leasing commissions)	37
Total Purchase Price	$	139,941

The revenue and net income associated with the acquisition of the industrial properties and land parcels, since their respective acquisition dates, are not significant to the three months ended March 31, 2020.

Real Estate Held for Sale

As of March 31, 2020, we had two industrial properties comprised of approximately 0.2 million square feet of GLA held for sale.

Sales

During the three months ended March 31, 2020, we sold nine industrial properties comprised of approximately 0.2 million square feet of GLA. Gross proceeds from the sales were $26,500 . The gain on sale of real estate attributable to these sales was $13,993 .

- Definition

The entire disclosure for certain real estate investment financial statements, real estate investment trust operating support agreements, real estate owned, retail land sales, time share transactions, as well as other real estate related disclosures.

+ References + Details

Indebtedness

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Indebtedness

The following table discloses certain information regarding our indebtedness:



	Outstanding Balance at						Interest Rate at March 31, 2020	Effective Interest Rate at Issuance	Maturity Date
	March 31, 2020			December 31, 2019			Interest Rate at March 31, 2020	Effective Interest Rate at Issuance	Maturity Date
Mortgage Loans Payable, Gross	$	173,103		$	174,360		4.03% – 6.50%	4.03% – 6.50%	July 2020 – August 2028
Unamortized Debt Issuance Costs	(593		)	(675		)
Mortgage Loans Payable, Net	$	172,510		$	173,685
Senior Unsecured Notes, Gross
2027 Notes	6,070			6,070			7.15%	7.11%	5/15/2027
2028 Notes	31,901			31,901			7.60%	8.13%	7/15/2028
2032 Notes	10,600			10,600			7.75%	7.87%	4/15/2032
2027 Private Placement Notes	125,000			125,000			4.30%	4.30%	4/20/2027
2028 Private Placement Notes	150,000			150,000			3.86%	3.86%	2/15/2028
2029 Private Placement Notes	75,000			75,000			4.40%	4.40%	4/20/2029
2029 II Private Placement Notes	150,000			150,000			3.97%	4.23%	7/23/2029
2030 Private Placement Notes	150,000			150,000			3.96%	3.96%	2/15/2030
Subtotal	$	698,571		$	698,571
Unamortized Debt Issuance Costs	(4,357		)	(4,485		)
Unamortized Discounts	(70		)	(71		)
Senior Unsecured Notes, Net	$	694,144		$	694,015
Unsecured Term Loans, Gross
2014 Unsecured Term Loan ^(A)	$	200,000		$	200,000		3.39%	N/A	1/29/2021
2015 Unsecured Term Loan ^(A)	260,000			260,000			2.89%	N/A	9/12/2022
Subtotal	$	460,000		$	460,000
Unamortized Debt Issuance Costs	(1,871		)	(2,135		)
Unsecured Term Loans, Net	$	458,129		$	457,865
Unsecured Credit Facility ^(B)	$	320,000		$	158,000		2.09%	N/A	10/29/2021

_______________

^(A) The interest rate at March 31, 2020 also reflects the derivative instruments we entered into to effectively convert the variable rate to a fixed rate. See Note 10.

^(B) The maturity date may be extended an additional year at our election, subject to certain restrictions. Amounts exclude unamortized debt issuance costs of $1,986 and $2,300 as of March 31, 2020 and December 31, 2019, respectively, which are included in the line item Prepaid Expenses and Other Assets, Net .

Mortgage Loans Payable, Net

As of March 31, 2020, mortgage loans payable are collateralized, and in some instances cross-collateralized, by industrial properties with a net carrying value of $262,852 . We believe the Operating Partnership and the Company were in compliance with all covenants relating to mortgage loans as of March 31, 2020.

Indebtedness

The following is a schedule of the stated maturities and scheduled principal payments of our indebtedness, exclusive of premiums, discounts and debt issuance costs, for the next five years as of March 31, and thereafter:



	Amount
Remainder of 2020	$	18,556
2021	587,294
2022	336,954
2023	321
2024	335
Thereafter	708,214
Total	$	1,651,674

Our unsecured credit facility (the "Unsecured Credit Facility"), our unsecured term loans (the "Unsecured Term Loans"), our Private Placement Notes and the indentures governing our senior unsecured notes contain certain financial covenants, including limitations on incurrence of debt and debt service coverage. Under the Unsecured Credit Facility and the Unsecured Term Loans an event of default can occur if the lenders, in their good faith judgment, determine that a material adverse change has occurred which could prevent timely repayment or materially impair our ability to perform our obligations under the loan agreements. We believe the Operating Partnership and the Company were in compliance with all covenants relating to the Unsecured Credit Facility, the Unsecured Term Loans, the Private Placement Notes and the indentures governing our senior unsecured notes as of March 31, 2020. However, these financial covenants are complex and there can be no assurance that these provisions would not be interpreted by our lenders and noteholders in a manner that could impose and cause us to incur material costs.

Fair Value

At March 31, 2020 and December 31, 2019, the fair value of our indebtedness was as follows:



	March 31, 2020				December 31, 2019
	Carrying Amount ^(A)		Fair Value		Carrying Amount ^(A)		Fair Value
Mortgage Loans Payable, Net	$	173,103	$	176,544	$	174,360	$	179,287
Senior Unsecured Notes, Net	698,501		701,948		698,500		756,351
Unsecured Term Loans	460,000		455,796		460,000		460,902
Unsecured Credit Facility	320,000		317,372		158,000		158,141
Total	$	1,651,604	$	1,651,660	$	1,490,860	$	1,554,681

_______________

^(A) The carrying amounts include unamortized premiums and discounts and exclude unamortized debt issuance costs.

The fair values of our mortgage loans payable were determined by discounting the future cash flows using the current rates at which similar loans would be made based upon similar remaining maturities. The current market rates we utilized were internally estimated. The fair value of the senior unsecured notes were determined by using rates, as advised by our bankers, that are based upon recent trades within the same series of the senior unsecured notes, recent trades for senior unsecured notes with comparable maturities, recent trades for fixed rate unsecured notes from companies with profiles similar to ours, as well as overall economic conditions. The fair value of the Unsecured Credit Facility and the Unsecured Term Loans was determined by discounting the future cash flows using current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining term, assuming no repayment until maturity. We have concluded that our determination of fair value for each of our mortgage loans payable, senior unsecured notes, the Unsecured Term Loans and the Unsecured Credit Facility was primarily based upon Level 3 inputs.

Variable Interest Entities

3 Months Ended

Mar. 31, 2020

Variable Interest Entities [Abstract]

Variable Interest Entities

Other Real Estate Partnerships

The Other Real Estate Partnerships are variable interest entities ("VIEs") of the Operating Partnership and the Operating Partnership is the primary beneficiary, thus causing the Other Real Estate Partnerships to be consolidated by the Operating Partnership. In addition, the Operating Partnership is a VIE of the Company and the Company is the primary beneficiary.

The following table summarizes the assets and liabilities of the Other Real Estate Partnerships included in our consolidated balance sheets, net of intercompany amounts:



	March 31, 2020		December 31, 2019
ASSETS
Assets:
Net Investment in Real Estate	$	242,214	$	240,847
Other Assets, Net	45,039		69,982
Total Assets	$	287,253	$	310,829
LIABILITIES AND PARTNERS' CAPITAL
Liabilities:
Mortgage Loans Payable, Net	$	10,928	$	11,009
Other Liabilities, Net	19,669		21,088
Partners' Capital	256,656		278,732
Total Liabilities and Partners' Capital	$	287,253	$	310,829

Joint Venture

Through a wholly-owned TRS of the Operating Partnership, we own a 49% interest in a Joint Venture with a third party partner for the purpose of developing, leasing, operating and potentially selling approximately 532 net developable acres of land located in the Phoenix, Arizona metropolitan area. The purchase price of the land was $49,000 and was acquired by the Joint Venture via cash equity contributions from us and our joint venture partner during 2018.

Under the Joint Venture's operating agreement, we act as the managing member of the Joint Venture and are entitled to receive fees for providing management, leasing, development, construction supervision, disposition and asset management services to the Joint Venture. In addition, the Joint Venture's operating agreement provides us the ability to earn an incentive fee based on the ultimate financial performance of the Joint Venture.

The Joint Venture has a 0.6 million square foot building under development (the "Project") at March 31, 2020. In connection with the Project, the Joint Venture entered into a construction loan with a capacity of $28,000 with a third party lender (the "Joint Venture Loan") during the three months ended March 31, 2020. At March 31, 2020, the Joint Venture Loan has a $0 outstanding balance. With respect to the Joint Venture Loan, we provided a guarantee to the lender, which upon default of the loan, would require us to pay up to six months of interest and Project operating expenses with a maximum obligation of $500 . Additionally, we provided the lender and our third party joint venture partner, guarantees that require timely completion of construction of the Project as well as the payment, subject to certain exceptions, of cost overruns incurred in the development of the Project. Total estimated investment for the Project is $42,800 and the Joint Venture is using a third party contractor to develop the building pursuant to a guaranteed maximum price contract. Lastly, we provided a guarantee to the lender related to typical non-recourse exceptions and an environmental indemnity. It is not possible to estimate the amount of additional costs, if any, that we may incur in connection with our completion guarantees to the third party lender and/or our joint venture partner as well as the non-recourse exception and environmental indemnity guarantees; however, we do not expect that we will be required to make any significant payments in satisfaction of these guarantees.

During the three months ended March 31, 2020, we recognized fees of $60 from the Joint Venture related to asset management and development services we provided to the Joint Venture. At March 31, 2020, we had a receivable from the Joint Venture of $670 .

As part of our assessment of the appropriate accounting treatment for the Joint Venture, we reviewed the operating agreement of the Joint Venture in order to determine our rights and the rights of our joint venture partner, including whether those rights are protective or participating. We found that the operating agreement contains certain protective rights, such as the requirement of both member's approval to sell, finance or refinance the property and to pay capital expenditures and operating expenditures outside of the approved budget. However, we also found that we and our Joint Venture partner jointly (i) approve the annual budget, (ii) approve certain expenditures, (iii) review and approve the Joint Venture's tax return before filing, and (iv) approve each lease at a developed property. We consider the latter rights substantive participation rights that result in shared, joint power over the activities that most significantly impact the performance of the Joint Venture. As such, we concluded to account for our investment in the Joint Venture under the equity method of accounting.

Stockholders’ Equity of the Company and Partners' Capital of the Operating Partnership	3 Months Ended
	Mar. 31, 2020
Stockholders' Equity Note [Abstract]
Stockholders' Equity of the Company and Partners' Capital of the Operating Partnership	Stockholders' Equity of the Company and Partners' Capital of the Operating Partnership Noncontrolling Interest of the Company The equity positions of various individuals and entities that contributed their properties to the Operating Partnership in exchange for Limited Partner Units, as well as the equity positions of the holders of Limited Partner Units issued in connection with the grant of restricted limited partner Units ("RLP Units") pursuant to the Company's stock incentive plan, are collectively referred to as the “Noncontrolling Interests.” An RLP Unit is a class of limited partnership interest of the Operating Partnership that is structured as a “profits interest” for U.S. federal income tax purposes and is an award that is granted under our stock incentive plan. See Note 9. Subject to vesting and other certain exceptions (including the “book-up” requirements of RLP Units), the holders of Noncontrolling Interests may convert their Units into an equal number of shares of Common Stock, or a cash equivalent, at the Company's election. Net income is allocated to the Noncontrolling Interests based on the weighted average ownership percentage during the period. ATM Program On February 14, 2020, we entered into distribution agreements with certain sales agents to sell up to 14,000,000 shares of the Company's common stock, for up to $500,000 aggregate gross sales proceeds, from time to time in "at-the-market" offerings (the "2020 ATM Program"). Under the terms of the 2020 ATM Program, sales are to be made through transactions that are deemed to be "at-the-market" offerings, including sales made directly on the New York Stock Exchange , sales made through a market maker other than on an exchange or sales made through privately negotiated transactions. During the three months ended March 31, 2020, the Company did not issue any shares of common stock under the 2020 ATM Program.

Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income by component for the Company and the Operating Partnership for the three months ended March 31, 2020:



	Derivative Instruments			Accumulated Other Comprehensive Loss of the Operating Partnership			Comprehensive Loss Attributable to Noncontrolling Interest of the Company		Accumulated Other Comprehensive Loss of the Company
Balance as of December 31, 2019	$	(7,013	)	$	(7,013	)	$	130	$	(6,883	)
Other Comprehensive Loss Before Reclassifications	(14,972		)	(14,972		)	317		(14,655		)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income	484			484			—		484
Net Current Period Other Comprehensive Loss	(14,488		)	(14,488		)	317		(14,171		)
Balance as of March 31, 2020	$	(21,501	)	$	(21,501	)	$	447	$	(21,054	)

The following table summarizes the reclassifications out of accumulated other comprehensive income for both the Company and the Operating Partnership for the three months ended March 31, 2020 and 2019:



	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Income Components	Three Months Ended March 31, 2020		Three Months Ended March 31, 2019			Affected Line Items in the Consolidated Statements of Operations
Derivative Instruments:
Amortization of Previously Settled Derivative Instruments	$	102	$	24		Interest Expense
Net Settlement Payments (Receipts) to our Counterparties	382		(576		)	Interest Expense
Total	$	484	$	(552	)

The changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in other comprehensive income and is subsequently reclassified to earnings through interest expense over the life of the derivative or over the life of the debt. In the next 12 months, we expect to amortize approximately $410 into net income by increasing interest expense for derivative instruments we settled in previous periods. Additionally, recurring settlement amounts on the 2014 Swaps, the 2015 Swaps and the 2020 Swaps (as defined in Note 10) will also be reclassified to net income.

Earnings Per Share / Unit (EPS / EPU)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share / Unit (EPS / EPU)

Earnings Per Share and Earnings Per Unit ("EPS"/"EPU")

The computation of basic and diluted EPS of the Company is presented below:



	Three Months Ended March 31, 2020			Three Months Ended March 31, 2019
Numerator:
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders and Participating Securities	$	40,634		$	23,803
Net Income Allocable to Participating Securities	(59		)	(60		)
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders	$	40,575		$	23,743
Denominator (In Thousands):
Weighted Average Shares - Basic	126,934			126,194
Effect of Dilutive Securities:
Performance Units (See Note 9)	177			262
Weighted Average Shares - Diluted	127,111			126,456
Basic and Diluted EPS:
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders	$	0.32		$	0.19

The computation of basic and diluted EPU of the Operating Partnership is presented below:



	Three Months Ended March 31, 2020			Three Months Ended March 31, 2019
Numerator:
Net Income Available to Unitholders and Participating Securities	$	41,479		$	24,314
Net Income Allocable to Participating Securities	(123		)	(76		)
Net Income Available to Unitholders	$	41,356		$	24,238
Denominator (In Thousands):
Weighted Average Units - Basic	129,070			128,818
Effect of Dilutive Securities:
Performance Units and certain Performance RLP Units (See Note 6)	330			360
Weighted Average Units - Diluted	129,400			129,178
Basic and Diluted EPU:
Net Income Available to Unitholders	$	0.32		$	0.19

At March 31, 2020 and 2019, participating securities for the Company include 210,886 and 287,273 , respectively, of Service Awards (see Note 9), which participate in non-forfeitable distributions. At March 31, 2020 and 2019, participating securities for the Operating Partnership include 445,735 and 407,457 , respectively, of Service Awards and certain Performance Awards (See Note 9), which participate in non-forfeitable distributions. Under the two class method, participating security holders are allocated income, in proportion to total weighted average shares or Units outstanding, based upon the greater of net income or common stock dividends or Unit distributions declared.

Long-Term Compensation	3 Months Ended
Long-Term Compensation	Mar. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]
Long-Term Compensation	Awards with Performance Measures During the three months ended March 31, 2020, the Company granted 59,263 performance units ("Performance Units") and 322,477 RLP Units, based on performance-based criteria ("Performance RLP Units" and, together with the Performance Units, collectively the "Performance Awards") to certain employees, which had a fair value of approximately $7,883 on the grant date as determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. A portion of each Performance Award vests based upon the total shareholder return ("TSR") of the Company's common stock compared to the TSRs of the FTSE Nareit All Equity Index and the remainder vests based upon the TSR of the Company’s common stock compared to nine other peer industrial real estate companies. The performance periods for such awards are one year, two years and three years . Compensation expense is charged to earnings over the applicable vesting period for the Performance Awards. At the end of the measuring period, vested Performance Units convert into shares of common stock. Service Based Awards For the three months ended March 31, 2020, the Company awarded 75,261 shares of restricted stock units ("Service Units") and 109,761 RLP Units based on service-based criteria ("Service RLP Units" and together with the Service Units, collectively the "Service Awards") to certain employees and outside directors, which had an aggregate fair value of approximately $8,102 on the date such awards were approved by the Compensation Committee of the Board of Directors. The Service Awards granted to employees vest ratably over a period of three years based on continued employment. Service Awards granted to outside directors vest after a one year period. The Operating Partnership issued restricted Unit awards to the Company in the same amount and on substantially the same terms as the restricted stock awards. Compensation expense is charged to earnings over the vesting periods for the Service Awards. Retirement Eligibility Commencing January 1, 2020, all award agreements issued underlying Performance Awards and Service Awards contain a retirement benefit for employees with at least 10 years of continuous service and are at least 60 years old. For employees that meet the age and service eligibility requirements, their awards are non -forfeitable. As such, during the three months ended March 31, 2020, we expensed 100% of the awards granted to retirement-eligible employees at the grant date as if fully vested. For employees who will meet the age and service eligibility requirements during the normal vesting periods, the grants are amortized over the shorter service period. Outstanding Restricted Stock/Restricted Unit Awards, Performance Units and RLP Units We recognized $3,641 and $1,762 for the three months ended March 31, 2020 and 2019, respectively, in compensation expense related to the amortization of the Service Awards and the Performance Awards. Service Award and Performance Award amortization capitalized in connection with development activities was $982 and $203 for the three months ended March 31, 2020 and 2019. At March 31, 2020, we had $21,563 in unrecognized compensation related to unvested Service Awards and Performance Awards. The weighted average period that the unrecognized compensation is expected to be recognized is 1.15 years.

Derivatives

3 Months Ended

Mar. 31, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

Our objectives in using derivatives are to add stability to interest expense and to manage our cash flow volatility and exposure to interest rate movements. To accomplish these objectives, we primarily use derivative instruments as part of our interest rate risk management strategy. Derivative instruments designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

Cash Flow Hedges

During the three months ended March 31, 2020, we entered into one one-year interest rate swap with a notional value of $150,000 to manage our exposure to changes in the one month LIBOR rate (the "2020 Swap"). The 2020 Swap, which is effective commencing April 1, 2020, fixes the one month LIBOR rate component on $150,000 of our outstanding balance on our Unsecured Credit Facility at 0.42% . We designated the 2020 Swap as a cash flow hedge.

During the three months ended March 31, 2020, in anticipation of refinancing our 2014 Term Loan (see Note 4) in January 2021, we also entered into three five-year interest rate swaps with an aggregate notional value of $200,000 to fix the one month LIBOR rate (the "2021 Swaps"). The 2021 Swaps, which are effective commencing February 1, 2021, fix the one month LIBOR rate at 0.99% . We have designated the 2021 Swaps as cash flow hedges.

In connection with the originations of the Unsecured Term Loans (see Note 4), we entered into interest rate swaps to manage our exposure to changes in the one month LIBOR rate. The four interest rate swaps, which fix the variable rate of the 2014 Unsecured Term Loan, have an aggregate notional value of $200,000 , mature on January 29, 2021 and fix the LIBOR rate at a weighted average rate of 2.29% (the "2014 Swaps"). The six interest rate swaps, which fix the variable rate of the 2015 Unsecured Term Loan, have an aggregate notional value of $260,000 , mature on September 12, 2022 and fix the LIBOR rate at a weighted average rate of 1.79% (the "2015 Swaps"). We designated the 2014 Swaps and 2015 Swaps as cash flow hedges.

Our agreements with our derivative counterparties contain certain cross-default provisions that may be triggered in the event that our other indebtedness is in default, subject to certain thresholds. As of March 31, 2020, we had not posted any collateral related to these agreements and were not in breach of any of the provisions of these agreements. If we had breached these agreements, we could have been required to settle our obligations under the agreements at their termination value.

The following table sets forth our financial liabilities related to the 2014 Swaps, the 2015 Swaps, the 2020 Swap and the 2021 Swaps which are included in the line item Accounts Payable, Accrued Expenses and Other Liabilities and are accounted for at fair value on a recurring basis as of March 31, 2020:



				Fair Value Measurements:
Description	Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)	Significant Other Observable Inputs (Level 2)			Unobservable Inputs (Level 3)
Derivatives designated as a hedging instrument:
Liabilities:
2014 Swaps	$	(3,218	)	—	$	(3,218	)	—
2015 Swaps	$	(9,501	)	—	$	(9,501	)	—
2020 Swap	$	(116	)	—	$	(116	)	—
2021 Swaps	$	(4,944	)	—	$	(4,944	)	—

There was no ineffectiveness recorded on the 2014 Swaps, the 2015 Swaps, the 2020 Swap or the 2021 Swaps during the three months ended March 31, 2020. See Note 7 for more information regarding our derivatives.

The estimated fair value of the 2014 Swaps, the 2015 Swaps, the 2020 Swap and the 2021 Swaps was determined using the market standard methodology of netting the discounted fixed cash payments and the discounted expected variable cash receipts. The variable cash receipts are based on an expectation of interest rates (forward curves) derived from observable market interest rate curves. In addition, credit valuation adjustments are incorporated in the fair value to account for potential non-performance risk, including our own non-performance risk and the respective counterparty's non-performance risk. We determined that the significant inputs used to value the 2014 Swaps, the 2015 Swaps, the 2020 Swap and the 2021 Swaps fell within Level 2 of the fair value hierarchy.

In July 2017, the Financial Conduct Authority (the authority that regulates LIBOR) announced it intends to stop compelling banks to submit rates for the calculation of LIBOR after 2021. The Alternative Reference Rates Committee ("ARRC") has proposed that the Secured Overnight Financing Rate ("SOFR") is the rate that represents best practice as the alternative to LIBOR for use in derivatives and other financial contracts that are currently indexed to LIBOR. ARRC has proposed a paced market transition plan to SOFR from LIBOR and organizations are currently working on industry wide and company specific transition plans as it relates to derivatives and cash markets exposed to LIBOR. We have contracts that are indexed to LIBOR and are monitoring this activity and evaluating the related risks.

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	Related Party Transactions At March 31, 2020 and December 31, 2019, the Operating Partnership had receivable balances of $9,670 and $10,031 , respectively, from a direct wholly-owned subsidiary of the Company.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In the normal course of business, we are involved in legal actions arising from the ownership of our industrial properties. In our opinion, the liabilities, if any, that may ultimately result from such legal actions are not expected to have a materially adverse effect on our consolidated financial position, operations or liquidity. In conjunction with the development of industrial properties, we have entered into agreements with general contractors for the construction of industrial properties. At March 31, 2020, we had nine industrial properties totaling approximately 1.5 million square feet of GLA under construction. The estimated total investment as of March 31, 2020 is approximately $154,400 . Of this amount, approximately $82,000 remains to be funded. There can be no assurance that the actual completion cost will not exceed the estimated total investment.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events From April 1, 2020 to April 28, 2020 , we sold two industrial properties for $13,455 , excluding transaction costs. Additionally, during that same period, we acquired one industrial property for a purchase price of $9,125 , excluding transaction costs. On April 9, 2020, we repaid $15,115 of mortgage loans payable that had an original maturity in July 2020. Subsequent to March 31, 2020, the United States continues to be severely impacted by the COVID-19 pandemic and by the economic effects of government responses, such as “stay-at-home” orders and various restrictions on certain business activities, which have materially disrupted the economy. In April 2020, we have received some rent relief requests from tenants at our properties, most often in the form of rent deferral requests, as a result of COVID-19. We are evaluating each tenant rent relief request on an individual basis, considering a number of factors. Not all tenant relief requests will ultimately result in our granting any form of rent or other relief, nor do we plan to forgo our contractual rights under our lease agreements in connection with any such requests. While we are not able to estimate the impact of the COVID-19 pandemic at this time, the pandemic could materially affect our future financial and operational results.

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the accounting policies described in the consolidated financial statements and related notes included in our annual report on Form 10-K for the year ended December 31, 2019 ("2019 Form 10-K") and should be read in conjunction with such consolidated financial statements and related notes. The 2019 year end consolidated balance sheet data included in this Form 10-Q filing was derived from the audited consolidated financial statements in our 2019 Form 10-K, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("GAAP"). The following notes to these interim consolidated financial statements highlight significant changes to the notes included in the December 31, 2019 audited consolidated financial statements included in our 2019 Form 10-K and present interim disclosures as required by the Securities and Exchange Commission.
Reclassifications	Reclassifications Certain amounts included in the Consolidated Financial Statements for 2019 have been reclassified to conform to the 2020 financial statement presentation.
Use of Estimates	Use of Estimates In order to conform with GAAP, in preparation of our consolidated financial statements we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of March 31, 2020 and December 31, 2019, and the reported amounts of revenues and expenses for the three months ended March 31, 2020 and 2019. Actual results could differ from those estimates. In our opinion, the accompanying unaudited interim consolidated financial statements reflect all adjustments necessary for a fair statement of our financial position as of March 31, 2020 and December 31, 2019, the results of our operations and comprehensive income for each of the three months ended March 31, 2020 and 2019, and our cash flows for each of the three months ended March 31, 2020 and 2019. All adjustments are of a normal recurring nature.

- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592

+ Details

Investment in Real Estate Investment in Real Estate (Tables)

3 Months Ended

Mar. 31, 2020

Real Estate [Abstract]

Summary of Acquisition Purchase Price Allocation



Land	$	83,511
Building and Improvements/Construction in Progress	56,048
In-Place Leases	981
Above Market Leases	134
Below Market Leases	(770		)
Other Assets (leasing commissions)	37
Total Purchase Price	$	139,941

Indebtedness (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Summary of Indebtedness

The following table discloses certain information regarding our indebtedness:



	Outstanding Balance at						Interest Rate at March 31, 2020	Effective Interest Rate at Issuance	Maturity Date
	March 31, 2020			December 31, 2019			Interest Rate at March 31, 2020	Effective Interest Rate at Issuance	Maturity Date
Mortgage Loans Payable, Gross	$	173,103		$	174,360		4.03% – 6.50%	4.03% – 6.50%	July 2020 – August 2028
Unamortized Debt Issuance Costs	(593		)	(675		)
Mortgage Loans Payable, Net	$	172,510		$	173,685
Senior Unsecured Notes, Gross
2027 Notes	6,070			6,070			7.15%	7.11%	5/15/2027
2028 Notes	31,901			31,901			7.60%	8.13%	7/15/2028
2032 Notes	10,600			10,600			7.75%	7.87%	4/15/2032
2027 Private Placement Notes	125,000			125,000			4.30%	4.30%	4/20/2027
2028 Private Placement Notes	150,000			150,000			3.86%	3.86%	2/15/2028
2029 Private Placement Notes	75,000			75,000			4.40%	4.40%	4/20/2029
2029 II Private Placement Notes	150,000			150,000			3.97%	4.23%	7/23/2029
2030 Private Placement Notes	150,000			150,000			3.96%	3.96%	2/15/2030
Subtotal	$	698,571		$	698,571
Unamortized Debt Issuance Costs	(4,357		)	(4,485		)
Unamortized Discounts	(70		)	(71		)
Senior Unsecured Notes, Net	$	694,144		$	694,015
Unsecured Term Loans, Gross
2014 Unsecured Term Loan ^(A)	$	200,000		$	200,000		3.39%	N/A	1/29/2021
2015 Unsecured Term Loan ^(A)	260,000			260,000			2.89%	N/A	9/12/2022
Subtotal	$	460,000		$	460,000
Unamortized Debt Issuance Costs	(1,871		)	(2,135		)
Unsecured Term Loans, Net	$	458,129		$	457,865
Unsecured Credit Facility ^(B)	$	320,000		$	158,000		2.09%	N/A	10/29/2021

_______________

^(A) The interest rate at March 31, 2020 also reflects the derivative instruments we entered into to effectively convert the variable rate to a fixed rate. See Note 10.

Schedule of Maturities



	Amount
Remainder of 2020	$	18,556
2021	587,294
2022	336,954
2023	321
2024	335
Thereafter	708,214
Total	$	1,651,674

Summary of Indebtedness at Estimated Fair Value

At March 31, 2020 and December 31, 2019, the fair value of our indebtedness was as follows:



	March 31, 2020				December 31, 2019
	Carrying Amount ^(A)		Fair Value		Carrying Amount ^(A)		Fair Value
Mortgage Loans Payable, Net	$	173,103	$	176,544	$	174,360	$	179,287
Senior Unsecured Notes, Net	698,501		701,948		698,500		756,351
Unsecured Term Loans	460,000		455,796		460,000		460,902
Unsecured Credit Facility	320,000		317,372		158,000		158,141
Total	$	1,651,604	$	1,651,660	$	1,490,860	$	1,554,681

_______________

^(A) The carrying amounts include unamortized premiums and discounts and exclude unamortized debt issuance costs.

Variable Interest Entities (Tables)

3 Months Ended

Mar. 31, 2020

Variable Interest Entities [Abstract]

Other Real Estate Partnerships' Summarized Balance Sheet

The following table summarizes the assets and liabilities of the Other Real Estate Partnerships included in our consolidated balance sheets, net of intercompany amounts:



	March 31, 2020		December 31, 2019
ASSETS
Assets:
Net Investment in Real Estate	$	242,214	$	240,847
Other Assets, Net	45,039		69,982
Total Assets	$	287,253	$	310,829
LIABILITIES AND PARTNERS' CAPITAL
Liabilities:
Mortgage Loans Payable, Net	$	10,928	$	11,009
Other Liabilities, Net	19,669		21,088
Partners' Capital	256,656		278,732
Total Liabilities and Partners' Capital	$	287,253	$	310,829

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2020

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income by component for the Company and the Operating Partnership for the three months ended March 31, 2020:



	Derivative Instruments			Accumulated Other Comprehensive Loss of the Operating Partnership			Comprehensive Loss Attributable to Noncontrolling Interest of the Company		Accumulated Other Comprehensive Loss of the Company
Balance as of December 31, 2019	$	(7,013	)	$	(7,013	)	$	130	$	(6,883	)
Other Comprehensive Loss Before Reclassifications	(14,972		)	(14,972		)	317		(14,655		)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income	484			484			—		484
Net Current Period Other Comprehensive Loss	(14,488		)	(14,488		)	317		(14,171		)
Balance as of March 31, 2020	$	(21,501	)	$	(21,501	)	$	447	$	(21,054	)

Reclassification Out of Accumulated Other Comprehensive Income



	Amounts Reclassified from Accumulated Other Comprehensive Loss
Details about Accumulated Other Comprehensive Income Components	Three Months Ended March 31, 2020		Three Months Ended March 31, 2019			Affected Line Items in the Consolidated Statements of Operations
Derivative Instruments:
Amortization of Previously Settled Derivative Instruments	$	102	$	24		Interest Expense
Net Settlement Payments (Receipts) to our Counterparties	382		(576		)	Interest Expense
Total	$	484	$	(552	)

Earnings Per Share / Unit (EPS / EPU) (Tables)

3 Months Ended

Mar. 31, 2020

Computation of Basic and Diluted Earnings Per Share / Unit

The computation of basic and diluted EPS of the Company is presented below:



	Three Months Ended March 31, 2020			Three Months Ended March 31, 2019
Numerator:
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders and Participating Securities	$	40,634		$	23,803
Net Income Allocable to Participating Securities	(59		)	(60		)
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders	$	40,575		$	23,743
Denominator (In Thousands):
Weighted Average Shares - Basic	126,934			126,194
Effect of Dilutive Securities:
Performance Units (See Note 9)	177			262
Weighted Average Shares - Diluted	127,111			126,456
Basic and Diluted EPS:
Net Income Available to First Industrial Realty Trust, Inc.'s Common Stockholders	$	0.32		$	0.19

First Industrial, L.P.

Computation of Basic and Diluted Earnings Per Share / Unit

The computation of basic and diluted EPU of the Operating Partnership is presented below:



	Three Months Ended March 31, 2020			Three Months Ended March 31, 2019
Numerator:
Net Income Available to Unitholders and Participating Securities	$	41,479		$	24,314
Net Income Allocable to Participating Securities	(123		)	(76		)
Net Income Available to Unitholders	$	41,356		$	24,238
Denominator (In Thousands):
Weighted Average Units - Basic	129,070			128,818
Effect of Dilutive Securities:
Performance Units and certain Performance RLP Units (See Note 6)	330			360
Weighted Average Units - Diluted	129,400			129,178
Basic and Diluted EPU:
Net Income Available to Unitholders	$	0.32		$	0.19

Derivatives (Tables)

3 Months Ended

Mar. 31, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value Measurements on Recurring Basis



				Fair Value Measurements:
Description	Fair Value			Quoted Prices in Active Markets for Identical Assets (Level 1)	Significant Other Observable Inputs (Level 2)			Unobservable Inputs (Level 3)
Derivatives designated as a hedging instrument:
Liabilities:
2014 Swaps	$	(3,218	)	—	$	(3,218	)	—
2015 Swaps	$	(9,501	)	—	$	(9,501	)	—
2020 Swap	$	(116	)	—	$	(116	)	—
2021 Swaps	$	(4,944	)	—	$	(4,944	)	—

- Definition

Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References + Details

Organization - Additional Information (Details) ft² in Millions	3 Months Ended
	Mar. 31, 2020 ft² Property State
Organization [Line Items]
Number of industrial properties \| Property	436
Number of states in which industrial properties are located \| State	21
Gross leasable area (GLA) of industrial properties owned	62.6
Joint Venture
Organization [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
Gross leasable area (GLA) of industrial properties owned	0.6
Ownership
Organization [Line Items]
Company's ownership interest	97.90%
Limited partners' ownership interest in the Operating Partnership	2.10%
Other Real Estate Partnerships
Organization [Line Items]
Company's ownership interest	100.00%
Number of Other Real Estate Partnerships	8
Operating Partnership's minimum ownership interest in the Other Real Estate Partnerships	99.00%
General partners' minimum ownership interest in the Other Real Estate Partnerships	0.01%

Investment in Real Estate - Additional Information (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) ft² Property
Real Estate Properties [Line Items]
Number of industrial properties	436
Gross leasable area (GLA) of industrial properties \| ft²	62.6
Acquisition Activity
Real Estate Properties [Line Items]
Number of industrial properties	4
Gross leasable area (GLA) of industrial properties \| ft²	0.8
Number of Land Parcels	2
Held for Sale Activity
Real Estate Properties [Line Items]
Number of industrial properties	2
Gross leasable area (GLA) of industrial properties \| ft²	0.2
Disposition Activity
Real Estate Properties [Line Items]
Number of industrial properties	9
Gross leasable area (GLA) of industrial properties \| ft²	0.2
Proceeds from sale of industrial properties \| $	$ 26,500
Gain on sale of real estate \| $	$ 13,993

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References + Details

Investment in Real Estate Investment in Real Estate - Summary of Purchase Price Allocation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Real Estate [Line Items]
Land	$ 1,060,358	$ 957,478
Buildings and Improvements	2,813,421	$ 2,782,430
Acquisition Activity
Real Estate [Line Items]
Land	83,511
Buildings and Improvements	56,048
Other Assets	37
Purchase price of industrial properties acquired	139,941
Acquisition Activity \| In-Place Leases
Real Estate [Line Items]
Acquired finite lived intangible assets, fair value	981
Acquisition Activity \| Above Market Leases [Member]
Real Estate [Line Items]
Acquired finite lived intangible assets, fair value	134
Acquisition Activity \| Below Market Leases
Real Estate [Line Items]
Acquired finite lived intangible liabilities, fair value	$ (770)

Indebtedness - Summary of Indebtedness (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2020

Dec. 31, 2019

Indebtedness - Schedule of Maturities (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Debt Disclosure [Abstract]
Remainder of 2020	$ 18,556
2021	587,294
2022	336,954
2023	321
2024	335
Thereafter	708,214
Total	$ 1,651,674

Variable Interest Entities - Summarized Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Net Investment in Real Estate	$ 3,186,100	$ 3,025,429
Total Assets	3,662,774	3,518,828
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	172,510	173,685
Total Liabilities and Equity/Partners' Capital	3,662,774	3,518,828
Other Real Estate Partnerships
Assets:
Net Investment in Real Estate	242,214	240,847
Other Assets, Net	45,039	69,982
Total Assets	287,253	310,829
Liabilities and Partners' Capital:
Mortgage Loans Payable, Net	10,928	11,009
Other Liabilities, Net	19,669	21,088
Partners' Capital	256,656	278,732
Total Liabilities and Equity/Partners' Capital	$ 287,253	$ 310,829

Variable Interest Entities - Additional Information (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) ft² Property	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Variable Interest Entity [Line Items]
Gross leasable area (GLA) of industrial properties owned \| ft²	62.6
Interest and Operating Expense, Construction Loan	$ 12,804	$ 12,767
Net Investment in Real Estate	$ 3,186,100		$ 3,025,429
Joint Venture
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
Number of Acres \| Property	532
Purchase price	$ 49,000
Gross leasable area (GLA) of industrial properties owned \| ft²	0.6
Construction Loan	$ 28,000
Construction Loan Outstanding Balance	0
Interest and Operating Expense, Construction Loan	500
Net Investment in Real Estate	42,800
Asset Management Fees	60
Receivable balance due from joint venture	$ 670
Disposition Activity
Variable Interest Entity [Line Items]
Gross leasable area (GLA) of industrial properties owned \| ft²	0.2
Acquisition Activity
Variable Interest Entity [Line Items]
Purchase price	$ 139,941
Gross leasable area (GLA) of industrial properties owned \| ft²	0.8

Stockholders’ Equity of the Company and Partners' Capital of the Operating Partnership - Additional Information (Details) - ATM [Member] $ in Thousands	Feb. 14, 2020 USD ($) shares
Class of Stock [Line Items]
Shares of company stock issuable under an at-the-market offering \| shares	14,000,000
Aggregate Gross Sale Proceeds \| $	$ 500,000

Accumulated Other Comprehensive Income (Changes in AOCI) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 1,798,263
Ending Balance	1,790,981
Derivative Instruments
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(7,013)
Other Comprehensive Loss Before Reclassifications	(14,972)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income	484
Net Current Period Other Comprehensive Loss	(14,488)
Ending Balance	(21,501)
Comprehensive Loss Attributable to Noncontrolling Interest of the Company
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	130
Other Comprehensive Loss Before Reclassifications	317
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income	0
Net Current Period Other Comprehensive Loss	317
Ending Balance	447
Accumulated Other Comprehensive Loss of the Company
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(6,883)
Other Comprehensive Loss Before Reclassifications	(14,655)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income	484
Net Current Period Other Comprehensive Loss	(14,171)
Ending Balance	(21,054)
First Industrial, L.P. \| Accumulated Other Comprehensive Loss of the Operating Partnership
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(7,013)
Other Comprehensive Loss Before Reclassifications	(14,972)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income	484
Net Current Period Other Comprehensive Loss	(14,488)
Ending Balance	$ (21,501)

Accumulated Other Comprehensive Income - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Amortization to be reclassified from OCI into income	$ 410

Earnings Per Share / Unit (EPS / EPU) - Computation of Basic and Diluted EPS / EPU (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 40,634	$ 23,803
Net Income Allocable to Participating Securities	(59)	(60)
Net Income Available to Common Stockholders / Unitholders	$ 40,575	$ 23,743
Denominator:
Weighted Average Shares / Units - Basic	126,934	126,194
Performance Units and certain Performance RLP Units (See Note 6)	177	262
Weighted Average Shares / Units - Diluted	127,111	126,456
Basic and Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders / Unitholders	$ 0.32	$ 0.19
First Industrial, L.P.
Numerator:
Net Income Available to Common Stockholders / Unitholders and Participating Securities	$ 41,479	$ 24,314
Net Income Allocable to Participating Securities	(123)	(76)
Net Income Available to Common Stockholders / Unitholders	$ 41,356	$ 24,238
Denominator:
Weighted Average Shares / Units - Basic	129,070	128,818
Performance Units and certain Performance RLP Units (See Note 6)	330	360
Weighted Average Shares / Units - Diluted	129,400	129,178
Basic and Diluted Earnings Per Share / Unit:
Net Income Available to Common Stockholders / Unitholders	$ 0.32	$ 0.19

Earnings Per Share / Unit (EPS / EPU) - Additional Information (Details) - shares	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Unvested Restricted Stock / Unit Awards	210,886	287,273
First Industrial, L.P.
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Unvested Restricted Stock / Unit Awards	445,735	407,457

Long-Term Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization related to restricted stock/Unit awards and LTIP Unit Awards	$ 3,641	$ 1,762
Share-based Payment Arrangement, Amount Capitalized	982	$ 203
Unrecognized compensation related to unvested restricted stock/Unit awards and LTIP Unit Awards	$ 21,563
Weighted average period of unrecognized compensation expected to be recognized	1 year 1 month 24 days
Management \| Performance Share/Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock/Unit awards and LTIP Unit Awards issued	59,263
Fair value of restricted stock/Unit awards and LTIP Unit Awards issued	$ 7,883
Vesting period of restricted stock/Unit awards issued	3 years
Management \| LTIP Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock/Unit awards and LTIP Unit Awards issued	322,477
Management \| Restricted Stock/Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock/Unit awards and LTIP Unit Awards issued	75,261
Fair value of restricted stock/Unit awards and LTIP Unit Awards issued	$ 8,102
Vesting period of restricted stock/Unit awards issued	3 years
Management \| Service LTIP Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock/Unit awards and LTIP Unit Awards issued	109,761
Director \| Restricted Stock/Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of restricted stock/Unit awards issued	1 year

Derivatives - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
2020 Swap
Derivative [Line Items]
Swaps, Number of Instruments Held	1
Derivative, Notional Amount	$ 150,000
Debt instrument, LIBOR Rate	one month LIBOR
Swaps, Average Fixed Interest Rate	0.42%
2021 Swaps
Derivative [Line Items]
Swaps, Number of Instruments Held	3
Derivative, Notional Amount	$ 200,000
Debt instrument, LIBOR Rate	one month LIBOR
Swaps, Average Fixed Interest Rate	0.99%
2014 Swaps
Derivative [Line Items]
Swaps, Number of Instruments Held	4
Derivative, Notional Amount	$ 200,000
Debt instrument, LIBOR Rate	one month LIBOR
Swaps, Average Fixed Interest Rate	2.29%
2015 Swaps
Derivative [Line Items]
Swaps, Number of Instruments Held	6
Derivative, Notional Amount	$ 260,000
Debt instrument, LIBOR Rate	one month LIBOR
Swaps, Average Fixed Interest Rate	1.79%

Derivatives - Fair Value Measurements on Recurring Basis (Details) $ in Thousands	Mar. 31, 2020 USD ($)
2014 Swaps
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	$ (3,218)
2014 Swaps \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2014 Swaps \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(3,218)
2014 Swaps \| Fair Value, Measurements, Recurring \| Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2015 Swaps
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(9,501)
2015 Swaps \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2015 Swaps \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(9,501)
2015 Swaps \| Fair Value, Measurements, Recurring \| Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2020 Swap
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(116)
2020 Swap \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2020 Swap \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(116)
2020 Swap \| Fair Value, Measurements, Recurring \| Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2021 Swaps
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(4,944)
2021 Swaps \| Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	0
2021 Swaps \| Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	(4,944)
2021 Swaps \| Fair Value, Measurements, Recurring \| Unobservable Inputs (Level 3)
Derivatives, Fair Value [Line Items]
Hedging Instrument, Liability, Fair Value	$ 0

Related Party Transactions Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Related Party Transactions [Abstract]
Receivable balance due from a direct wholly-owned subsidiary	$ 9,670	$ 10,031

Commitments and Contingencies - Additional Information (Details) $ in Thousands, ft² in Millions	Mar. 31, 2020 USD ($) ft² Property
Other Commitments [Line Items]
Number of industrial properties \| Property	436
Gross leasable area (GLA) of industrial properties \| ft²	62.6
Development Activity
Other Commitments [Line Items]
Number of industrial properties \| Property	9
Gross leasable area (GLA) of industrial properties \| ft²	1.5
Estimated total investment \| $	$ 154,400
Estimated total investment remaining to be funded \| $	$ 82,000

Subsequent Events - Additional Information (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 09, 2020 USD ($)	Apr. 28, 2020 USD ($) Property	Mar. 31, 2020 USD ($) Property
Subsequent Event [Line Items]
Number of industrial properties \| Property			436
Disposition Activity
Subsequent Event [Line Items]
Number of industrial properties \| Property			9
Proceeds from sale of industrial properties \| $			$ 26,500
Acquisition Activity
Subsequent Event [Line Items]
Number of industrial properties \| Property			4
Purchase price \| $			$ 139,941
Subsequent Event \| Mortgage Loans Payable
Subsequent Event [Line Items]
Extinguishment of Debt, Amount \| $	$ 15,115
Subsequent Event \| Disposition Activity
Subsequent Event [Line Items]
Number of industrial properties \| Property		2
Proceeds from sale of industrial properties \| $		$ 13,455
Subsequent Event \| Acquisition Activity
Subsequent Event [Line Items]
Number of industrial properties \| Property		1
Purchase price \| $		$ 9,125