Accumulated Other Comprehensive Income (Changes in AOCI) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,248,372
Ending Balance	2,486,444
Derivative Instruments
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(4,331)
Other Comprehensive Gain Before Reclassifications	39,785
Amounts Reclassified from Accumulated Other Comprehensive Loss	1,780
Net Current Period Other Comprehensive Gain	41,565
Ending Balance	37,234
Comprehensive Gain (Loss) Attributable to Noncontrolling Interest of the Company
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	93
Other Comprehensive Gain Before Reclassifications	(937)
Amounts Reclassified from Accumulated Other Comprehensive Loss	0
Net Current Period Other Comprehensive Gain	(937)
Ending Balance	(844)
Accumulated Other Comprehensive Gain (Loss) of the Company
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(4,238)
Other Comprehensive Gain Before Reclassifications	38,848
Amounts Reclassified from Accumulated Other Comprehensive Loss	1,780
Net Current Period Other Comprehensive Gain	40,628
Ending Balance	36,390
First Industrial, L.P. | Accumulated Other Comprehensive Gain (Loss) of the Operating Partnership
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(4,331)
Other Comprehensive Gain Before Reclassifications	39,785
Amounts Reclassified from Accumulated Other Comprehensive Loss	1,780
Net Current Period Other Comprehensive Gain	41,565
Ending Balance	$ 37,234