CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 37,464	$ 23,491
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	22,953	23,200
Amortization of Debt Issuance Costs	855	778
Other Amortization, including Stock Based Compensation	6,626	8,112
Impairment of Real Estate	2,756	0
Provision for Bad Debt	88	75
Gain on Sale of Real Estate	(20,089)	(8,009)
Loss from Retirement of Debt	39	1,653
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	(6,706)	(4,147)
Increase in Deferred Rent Receivable, Net	(713)	(1,494)
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(6,249)	(3,571)
Net Cash Provided by Operating Activities	37,024	40,088
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(49,865)	(15,074)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(63,994)	(34,910)
Net Proceeds from Sales of Investments in Real Estate	41,691	19,916
Other Investing Activity	(3,053)	(1,700)
Net Cash Used in Investing Activities	(75,221)	(31,768)
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing and Equity Issuance Costs	(2,676)	(13)
Repurchase and Retirement of Restricted Stock/Units	(6,020)	(2,401)
Common Stock Dividends and Unit Distributions Paid	(26,565)	(23,017)
Repayments on Mortgage Loans Payable	(160,163)	(38,896)
Payments of Prepayment Penalties Associated with Retirement of Debt	0	(1,453)
Proceeds from Senior Unsecured Notes	300,000	0
Proceeds from Unsecured Credit Facility	162,000	85,000
Repayments on Unsecured Credit Facility	(206,500)	(22,500)
Net Cash Provided by (Used in) Financing Activities	60,076	(3,280)
Net Increase in Cash, Cash Equivalents and Restricted Cash	21,879	5,040
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	46,482	21,461
Cash, Cash Equivalents and Restricted Cash, End of Period	68,361	26,501
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity	1,602	1,027
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	27,558	25,977
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0
Assumption of Indebtedness and Other Liabilities in Connection with the Acquisition of Real Estate	11,724	0
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	32,006	22,186
Write-off of Fully Depreciated Assets	(13,663)	(7,023)
Noncontrolling Interest
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	1,172
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(5,009)	0
Common Stock
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	4	0
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	5,005	0
Common Stock
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	5,009	0
First Industrial, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	37,464	23,491
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation	22,953	23,200
Amortization of Debt Issuance Costs	855	778
Other Amortization, including Stock Based Compensation	6,626	8,112
Impairment of Real Estate	2,756	0
Provision for Bad Debt	88	75
Gain on Sale of Real Estate	(20,089)	(8,009)
Loss from Retirement of Debt	39	1,653
Increase in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net	(6,801)	(4,137)
Increase in Deferred Rent Receivable, Net	(713)	(1,494)
Decrease in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits	(6,249)	(3,571)
Net Cash Provided by Operating Activities	36,929	40,098
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate	(49,865)	(15,074)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs	(63,994)	(34,910)
Net Proceeds from Sales of Investments in Real Estate	41,691	19,916
Other Investing Activity	(3,053)	(1,700)
Net Cash Used in Investing Activities	(75,221)	(31,768)
CASH FLOWS FROM FINANCING ACTIVITIES:
Financing and Equity Issuance Costs	(2,676)	(13)
Repurchase and Retirement of Restricted Stock/Units	(6,020)	(2,401)
Common Stock Dividends and Unit Distributions Paid	(26,565)	(23,017)
Contributions from Noncontrolling Interests	116	7
Distributions to Noncontrolling Interests	(21)	(17)
Repayments on Mortgage Loans Payable	(160,163)	(38,896)
Payments of Prepayment Penalties Associated with Retirement of Debt	0	(1,453)
Proceeds from Senior Unsecured Notes	300,000	0
Proceeds from Unsecured Credit Facility	162,000	85,000
Repayments on Unsecured Credit Facility	(206,500)	(22,500)
Net Cash Provided by (Used in) Financing Activities	60,171	(3,290)
Net Increase in Cash, Cash Equivalents and Restricted Cash	21,879	5,040
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	46,482	21,461
Cash, Cash Equivalents and Restricted Cash, End of Period	68,361	26,501
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Expense Capitalized in Connection with Development Activity	1,602	1,027
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable	27,558	25,977
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	0	0
Assumption of Indebtedness and Other Liabilities in Connection with the Acquisition of Real Estate	11,724	0
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate	32,006	22,186
Write-off of Fully Depreciated Assets	(13,663)	(7,023)
First Industrial, L.P. | Limited Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	1,172
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	(5,009)	0
First Industrial, L.P. | General Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	36,271
Exchange of Limited Partnership Units for Common Stock/General Partnership Units:
Conversion of Limited Partner Units to Common Stock / General Partner Units	$ 5,009	$ 0