CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 126,875	$ 43,419	$ 297,674	$ 160,163
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation			88,286	80,309
Amortization of Debt Issuance Costs	801	782	2,287	2,666
Other Amortization, including Equity Based Compensation			24,779	23,861
Equity in (Income) Loss of Joint Ventures	7	15	(118,182)	154
Distributions from Joint Ventures			118,027	0
Gain on Sale of Real Estate	(83,907)	(8,879)	(84,204)	(66,378)
Straight-line Rental Income and Expense, Net			(16,895)	(12,826)
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net			(6,917)	(5,348)
Increase in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits			41,167	13,836
Net Cash Provided by Operating Activities			346,022	196,437
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate			(272,508)	(224,954)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs			(384,004)	(197,980)
Net Proceeds from Sales of Investments in Real Estate			122,516	114,644
Contributions to and Investments in Joint Ventures			(2,798)	(1,321)
Distributions from Joint Ventures			29,363	21,407
Increase in Escrow Deposits and Other Investing Activity			(4,036)	(3,398)
Net Cash Used in Investing Activities			(511,467)	(291,602)
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing and Equity Issuance Costs			(5,060)	(6,365)
Proceeds from the Issuance of Common Stock, Net of Underwriter's Discount			12,823	59,008
Tax Paid on Vested Equity Compensation			(2,942)	(5,126)
Common Stock Dividends and Unit Distributions Paid			(115,619)	(103,893)
Contributions from Noncontrolling Interests			103	0
Distributions to Noncontrolling Interests			(4,418)	0
Repayments on Mortgage Loans Payable			(69,387)	(61,097)
Proceeds from Unsecured Term Loans			165,000	0
Proceeds from Unsecured Credit Facility			600,000	159,000
Repayments on Unsecured Credit Facility			(322,000)	(85,000)
Net Cash Provided by (Used in) Financing Activities			258,500	(43,473)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash			93,055	(138,638)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year			58,780	199,658
Cash, Cash Equivalents and Restricted Cash, End of Period	151,835	61,020	151,835	61,020
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity and Joint Venture Investment			12,551	8,150
Cash Paid for Operating Lease Liabilities			2,571	2,407
Supplemental Schedule of Non-Cash Operating Activities:
Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets			366	354
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	40,794	36,701	40,794	36,701
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	0	0
Assumption of Other Assets in Connection with the Acquisition of Real Estate			0	3,611
Assumption of Liabilities in Connection with the Acquisition of Real Estate			2,085	3,451
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate			112,739	66,092
Tenant Improvements Funded by Tenant			1,680	16,239
Write-off of Fully Depreciated Assets			(28,686)	(25,106)
Noncontrolling Interests
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	2,987	973
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(1,441)	(1,365)	(2,712)	(1,387)
Common Stock
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	1	1	1
Additional Paid-in Capital
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	1,441	1,364	2,711	1,386
First Industrial, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	126,875	43,419	297,674	160,163
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation			88,286	80,309
Amortization of Debt Issuance Costs	801	782	2,287	2,666
Other Amortization, including Equity Based Compensation			24,779	23,861
Equity in (Income) Loss of Joint Ventures	7	15	(118,182)	154
Distributions from Joint Ventures			118,027	0
Gain on Sale of Real Estate	(83,907)	(8,879)	(84,204)	(66,378)
Straight-line Rental Income and Expense, Net			(16,895)	(12,826)
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net			(6,974)	(5,307)
Increase in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits			41,167	13,836
Net Cash Provided by Operating Activities			345,965	196,478
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate			(272,508)	(224,954)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs			(384,004)	(197,980)
Net Proceeds from Sales of Investments in Real Estate			122,516	114,644
Contributions to and Investments in Joint Ventures			(2,798)	(1,321)
Distributions from Joint Ventures			29,363	21,407
Increase in Escrow Deposits and Other Investing Activity			(4,036)	(3,398)
Net Cash Used in Investing Activities			(511,467)	(291,602)
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing and Equity Issuance Costs			(5,060)	(6,365)
Proceeds from the Issuance of Common Stock, Net of Underwriter's Discount			12,823	(59,008)
Tax Paid on Vested Equity Compensation			(2,942)	(5,126)
Common Stock Dividends and Unit Distributions Paid			(115,619)	(103,893)
Contributions from Noncontrolling Interests			242	35
Distributions to Noncontrolling Interests			(4,500)	(76)
Repayments on Mortgage Loans Payable			(69,387)	(61,097)
Proceeds from Unsecured Term Loans			165,000	0
Proceeds from Unsecured Credit Facility			600,000	159,000
Repayments on Unsecured Credit Facility			(322,000)	(85,000)
Net Cash Provided by (Used in) Financing Activities			258,557	(43,514)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash			93,055	(138,638)
Cash, Cash Equivalents and Restricted Cash, Beginning of Year			58,780	199,658
Cash, Cash Equivalents and Restricted Cash, End of Period	151,835	61,020	151,835	61,020
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity and Joint Venture Investment			12,551	8,150
Cash Paid for Operating Lease Liabilities			2,571	2,407
Supplemental Schedule of Non-Cash Operating Activities:
Operating Lease Liabilities Arising from Obtaining Right-of-Use Assets			366	354
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	40,794	36,701	40,794	36,701
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0	0	0
Assumption of Other Assets in Connection with the Acquisition of Real Estate			0	3,611
Assumption of Liabilities in Connection with the Acquisition of Real Estate			2,085	3,451
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate			112,739	66,092
Tenant Improvements Funded by Tenant			1,680	16,239
Write-off of Fully Depreciated Assets			(28,686)	(25,106)
First Industrial, L.P. | Limited Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	2,923	975
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(1,441)	(1,365)	(2,712)	(1,387)
First Industrial, L.P. | General Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	123,866	42,424
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	$ 1,441	$ 1,365	$ 2,712	$ 1,387