Accumulated Other Comprehensive Income (Changes in AOCI) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	$ 2,248,372
Ending Balance	2,371,559
Derivative Instruments
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(4,331)
Other Comprehensive Gain Before Reclassifications	14,518
Amounts Reclassified from Accumulated Other Comprehensive Loss	2,478
Net Current Period Other Comprehensive Gain	16,996
Ending Balance	12,665
Comprehensive Gain (Loss) Attributable to Noncontrolling Interest of the Company
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	93
Other Comprehensive Gain Before Reclassifications	(387)
Amounts Reclassified from Accumulated Other Comprehensive Loss	0
Net Current Period Other Comprehensive Gain	(387)
Ending Balance	(294)
Accumulated Other Comprehensive Gain (Loss) of the Company
Accumulated Other Comprehensive Income [Line Items]
Beginning Balance	(4,238)
Other Comprehensive Gain Before Reclassifications	14,131
Amounts Reclassified from Accumulated Other Comprehensive Loss	2,478
Net Current Period Other Comprehensive Gain	16,609
Ending Balance	12,371
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	14,518
Amounts Reclassified from Accumulated Other Comprehensive Loss	2,478
Net Current Period Other Comprehensive Gain	16,996
Ending Balance	$ 12,665