CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Net Investment in Real Estate	$ 2,755,571	$ 2,705,826
Real Estate and Other Assets Held for Sale, Accumulated Depreciation and Amortization	9,384	0
Mortgage Loans Payable, Net	$ 301,661	$ 450,056
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	225,000,000	225,000,000
Common Stock, shares issued	120,557,079	119,883,180
Common Stock, shares outstanding	120,557,079	119,883,180
First Industrial, L.P.
Net Investment in Real Estate	$ 2,755,571	$ 2,705,826
Real Estate and Other Assets Held for Sale, Accumulated Depreciation and Amortization	9,384	0
Mortgage Loans Payable, Net	$ 301,661	$ 450,056
General Partner Units, units outstanding	120,557,079	119,883,180
Limited Partner Units, units outstanding	3,564,107	4,008,221
Other Real Estate Partnerships
Net Investment in Real Estate	$ 268,442	$ 270,708
Mortgage Loans Payable, Net	$ 20,833	$ 61,256