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Accumulated Other Comprehensive Income (Changes in AOCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 1,475,877 $ 1,284,625
Ending Balance 1,679,911 1,475,877
Derivative Instruments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1,382 (4,804)
Other Comprehensive Income Before Reclassifications 1,987 1,645
Amounts Reclassified from Accumulated Other Comprehensive Income 205 4,541
Net Current Period Other Comprehensive Income 2,192 6,186
Ending Balance 3,574 1,382
Comprehensive (Loss) Income Attributable to Noncontrolling Interest of the Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (44) 161
Other Comprehensive Income Before Reclassifications (28) (205)
Amounts Reclassified from Accumulated Other Comprehensive Income 0 0
Net Current Period Other Comprehensive Income (28) (205)
Ending Balance (72) (44)
Accumulated Other Comprehensive (Loss) Income of the Company    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1,338 (4,643)
Other Comprehensive Income Before Reclassifications 1,959 1,440
Amounts Reclassified from Accumulated Other Comprehensive Income 205 4,541
Net Current Period Other Comprehensive Income 2,164 5,981
Ending Balance 3,502 1,338
First Industrial, L.P. | Accumulated Other Comprehensive Income of the Operating Partnership    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 1,382 (4,804)
Other Comprehensive Income Before Reclassifications 1,987 1,645
Amounts Reclassified from Accumulated Other Comprehensive Income 205 4,541
Net Current Period Other Comprehensive Income 2,192 6,186
Ending Balance $ 3,574 $ 1,382