CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY/ PARTNER'S CAPITAL - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in- Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive 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 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	115,398			112,412		2,986	115,398	112,347	2,986		65
Other Comprehensive Income	10,999				10,791	208	10,999			10,999
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	(385)	3	2,894	(3,282)
Stock Based Compensation Activity							(385)	(385)
Common Stock Dividends and Unit Distributions	(83,338)			(81,348)		(1,990)
Unit Distributions							(83,338)	(81,348)	(1,990)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	13	16,496			(16,509)	0	16,509	(16,509)
Retirement of Limited Partner Units	(934)					(934)	(934)		(934)
Reallocation - Additional Paid-in-Capital	0		(2,309)			2,309
Contributions from Noncontrolling Interest							124				124
Distributions to Noncontrolling Interest							(84)				(84)
Ending Balance at Sep. 30, 2018	$ 1,663,025	$ 1,263	$ 2,129,551	$ (514,065)	$ 12,129	$ 34,147
Ending Balance at Sep. 30, 2018							$ 1,673,183	$ 1,594,114	$ 65,804	$ 12,381	$ 884