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) Income	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) Income	First Industrial, L.P. Noncontrolling Interest
Beginning Balance at Dec. 31, 2016	$ 1,284,625	$ 1,172	$ 1,886,771	$ (641,859)	$ (4,643)	$ 43,184
Beginning Balance at Dec. 31, 2016							$ 1,295,063	$ 1,219,755	$ 79,156	$ (4,804)	$ 956
Increase (Decrease) in Stockholders' Equity / Partners' Capital [Roll Forward]
Net Income	208,301			201,456		6,845	208,301	201,313	6,845		143
Other Comprehensive Income	6,186				6,389	(203)	6,186			6,186
Issuance of Common Stock / Contribution of General Partner Units, Net of Issuance Costs	74,661	25	74,636				74,661	74,661
Stock Based Compensation Activity	6,210	2	6,932	(724)
Stock Based Compensation Activity							6,210	6,210
Common Stock Dividends and Unit Distributions	(104,106)			(100,720)		(3,386)
Unit Distributions							(104,106)	(100,720)	(3,386)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	364			(364)	0	364	(364)
Reallocation—Additional Paid-in-Capital	0		(1,593)			1,593
Contributions from Noncontrolling Interest							40				40
Distributions to Noncontrolling Interest							(360)				(360)
Reallocation—Other Comprehensive Income	0				(408)	408
Ending Balance at Dec. 31, 2017	1,475,877	1,199	1,967,110	(541,847)	1,338	48,077
Ending Balance at Dec. 31, 2017							1,485,995	1,401,583	82,251	1,382	779
Increase (Decrease) in Stockholders' Equity / Partners' Capital [Roll Forward]
Net Income	167,334			163,239		4,095	167,334	163,151	4,095		88
Other Comprehensive Income	2,192				2,138	54	2,192			2,192
Issuance of Common Stock / Contribution of General Partner Units, Net of Issuance Costs	145,408	48	145,360				145,408	145,408
Stock Based Compensation Activity	1,512	3	4,791	(3,282)
Stock Based Compensation Activity							1,512	1,512
Common Stock Dividends and Unit Distributions	(111,478)			(108,917)		(2,561)
Unit Distributions							(111,478)	(108,917)	(2,561)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	13	16,592			(16,605)	0	16,605	(16,605)
Retirement of Limited Partner Units	(934)					(934)	(934)		(934)
Reallocation—Additional Paid-in-Capital	0		(2,297)			2,297
Contributions from Noncontrolling Interest							126				126
Distributions to Noncontrolling Interest							(136)				(136)
Reallocation—Other Comprehensive Income	0				26	(26)
Ending Balance at Dec. 31, 2018	1,679,911	1,263	2,131,556	(490,807)	3,502	34,397
Ending 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	243,881			238,775		5,106	243,881	238,522	5,106		253
Other Comprehensive Income	(10,587)				(10,365)	(222)	(10,587)			(10,587)
Stock Based Compensation Activity	4,580	2	4,397	(1,696)		1,877
Stock Based Compensation Activity							4,580	2,703	1,877
Common Stock Dividends and Unit Distributions	(119,522)			(117,107)		(2,415)
Unit Distributions							(119,522)	(117,107)	(2,415)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	5	7,191			(7,196)	0	7,196	(7,196)
Reallocation—Additional Paid-in-Capital	0		(2,297)			2,297
Contributions from Noncontrolling Interest							32				32
Distributions to Noncontrolling Interest							(119)				(119)
Reallocation—Other Comprehensive Income	0				(20)	20
Ending Balance at Dec. 31, 2019	$ 1,798,263	$ 1,270	$ 2,140,847	$ (370,835)	$ (6,883)	$ 33,864
Ending Balance at Dec. 31, 2019							$ 1,808,284	$ 1,750,656	$ 63,618	$ (7,013)	$ 1,023