CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY/ PARTNER'S CAPITAL - 6 months ended Jun. 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	83,868			81,501		2,367	83,868	81,458	2,367		43
Other Comprehensive Income	9,297				9,097	200	9,297			9,297
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	(2,388)	3	891	(3,282)
Stock Based Compensation Activity							(2,388)	(2,388)
Common Stock Dividends and Unit Distributions	(55,316)			(53,898)		(1,418)
Unit Distributions							(55,316)	(53,898)	(1,418)
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	10	12,317			(12,327)	0	12,327	(12,327)
Retirement of Limited Partner Units	(934)					(934)	(934)		(934)
Reallocation - Additional Paid-in-Capital	0		(2,218)			2,218
Contributions from Noncontrolling Interest							121				121
Distributions to Noncontrolling Interest							(64)				(64)
Ending Balance at Jun. 30, 2018	$ 1,655,812	$ 1,260	$ 2,123,460	$ (517,526)	$ 10,435	$ 38,183
Ending Balance at Jun. 30, 2018							$ 1,665,987	$ 1,584,490	$ 69,939	$ 10,679	$ 879