Accumulated Other Comprehensive Loss (Changes in AOCI) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,338
Other Comprehensive Income Before Reclassifications	5,879
Amounts Reclassified from Accumulated Other Comprehensive Income	487
Net Current Period Other Comprehensive Income	6,366
Balance	7,704
Interest Rate Protection Agreements
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,382
Other Comprehensive Income Before Reclassifications	6,062
Amounts Reclassified from Accumulated Other Comprehensive Income	487
Net Current Period Other Comprehensive Income	6,549
Balance	7,931
Comprehensive Income Attributable to Noncontrolling Interest of the Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(44)
Other Comprehensive Income Before Reclassifications	(183)
Amounts Reclassified from Accumulated Other Comprehensive Income	0
Net Current Period Other Comprehensive Income	(183)
Balance	(227)
First Industrial, L.P.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,382
Balance	7,931
First Industrial, L.P. | Interest Rate Protection Agreements
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,382
Other Comprehensive Income Before Reclassifications	6,062
Amounts Reclassified from Accumulated Other Comprehensive Income	487
Net Current Period Other Comprehensive Income	6,549
Balance	$ 7,931