Accumulated Other Comprehensive Income (Loss) (Changes in AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ (4,643)	$ (9,667)
Other Comprehensive Income (Loss) Before Reclassifications	1,440	(2,489)
Amounts Reclassified from Accumulated Other Comprehensive Loss	4,541	7,513
Net Current Period Other Comprehensive Income (Loss)	5,981	5,024
Balance	1,338	(4,643)
Interest Rate Protection Agreements
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(4,804)	(10,043)
Other Comprehensive Income (Loss) Before Reclassifications	1,645	(2,274)
Amounts Reclassified from Accumulated Other Comprehensive Loss	4,541	7,513
Net Current Period Other Comprehensive Income (Loss)	6,186	5,239
Balance	1,382	(4,804)
Comprehensive Loss Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	161	376
Other Comprehensive Income (Loss) Before Reclassifications	(205)	(215)
Amounts Reclassified from Accumulated Other Comprehensive Loss	0	0
Net Current Period Other Comprehensive Income (Loss)	(205)	(215)
Balance	(44)	161
First Industrial, L.P.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(4,804)	(10,043)
Other Comprehensive Income (Loss) Before Reclassifications	1,645	(2,274)
Amounts Reclassified from Accumulated Other Comprehensive Loss	4,541	7,513
Net Current Period Other Comprehensive Income (Loss)	6,186	5,239
Balance	$ 1,382	$ (4,804)