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, 2017	$ 1,475,877	$ 1,199	$ 1,967,110	$ (541,847)	$ 1,338	$ 48,077
Beginning 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	37,464			36,292		1,172	37,464	36,271	1,172		21
Other Comprehensive Income (Loss)	6,549				6,366	183	6,549			6,549
Stock Based Compensation Activity	(4,385)	3	(1,106)	(3,282)		0
Stock Based Compensation Activity							(4,385)	(4,385)
Common Stock Dividends and Unit Distributions	(27,107)			(26,332)		(775)
Unit Distributions							(27,107)	(26,332)	(775)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	4	5,005			(5,009)	0	5,009	(5,009)
Retirement of Limited Partner Units	(934)					(934)	(934)		(934)
Reallocation - Additional Paid-in-Capital	0		(292)			292
Reallocation - Other Comprehensive Income						0
Contributions from Noncontrolling Interest							116				116
Distributions to Noncontrolling Interest							(21)				(21)
Ending Balance at Mar. 31, 2018	1,487,464	1,206	1,970,717	(535,169)	7,704	43,006
Ending Balance at Mar. 31, 2018							1,497,677	1,412,146	76,705	7,931	895
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 Income (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
Retirement of Limited Partner Units						0
Reallocation - Additional Paid-in-Capital	0		(3,238)			3,238
Reallocation - Other Comprehensive Income	0				(7)	7
Contributions from Noncontrolling Interest											0
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