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