CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income		$ 208,301	$ 125,684	$ 76,705
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation		94,078	95,514	92,955
Amortization of Debt Issuance Costs		3,162	3,219	3,159
Other Amortization, including Stock Based Compensation		29,252	28,403	28,359
Impairment of Real Estate		0	0	626
Provision for Bad Debt		177	563	954
Gain on Sale of Real Estate	[1]	(131,269)	(68,202)	(48,906)
Loss from Retirement of Debt		1,775	0	0
Mark-to-Market Loss on Interest Rate Protection Agreements		0	0	11,546
(Increase) Decrease in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net		(5,829)	965	(2,686)
Increase in Deferred Rent Receivable, Net		(5,299)	(6,602)	(6,181)
(Decrease) Increase in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits		(465)	(5,655)	5,673
Payments of Discounts and Prepayment Penalties Associated with Retirement of Debt		(1,453)	(554)	0
Gain on Casualty and Involuntary Conversion		(1,321)	0	0
Other Operating Activity		0	0	(55)
Net Cash Provided by Operating Activities		191,109	173,335	162,149
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate		(175,303)	(107,484)	(168,122)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs		(146,003)	(179,994)	(150,079)
Net Proceeds from Sales of Investments in Real Estate		228,102	163,435	154,024
Proceeds from Casualty and Involuntary Conversion		10,094	0	0
Settlement of Interest Rate Protection Agreements		0	0	(11,546)
(Increase) Decrease in Escrows		(13,169)	13,008	(24,037)
Other Investing Activity		51	43	2,686
Net Cash Used in Investing Activities		(96,228)	(110,992)	(197,074)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt and Equity Issuance Costs		(6,864)	(375)	(5,158)
Proceeds from the Issuance of Common Stock/Contribution of General Partner Units		74,880	124,936	0
Repurchase and Retirement of Restricted Stock/Units		(2,401)	(5,242)	(2,101)
Common Stock Dividends and Unit Distributions Paid		(100,524)	(82,696)	(55,811)
Repayments on Mortgage Loans Payable		(46,832)	(70,969)	(35,004)
Proceeds from Senior Unsecured Notes		200,000	0	0
Repayments of Senior Unsecured Notes		(156,852)	(159,125)	0
Proceeds from Unsecured Term Loans		0	0	260,000
Proceeds from Unsecured Credit Facility		429,000	442,000	321,500
Repayments on Unsecured Credit Facility		(474,000)	(305,000)	(454,000)
Net Cash (Used in) Provided by Financing Activities		(83,593)	(56,471)	29,426
Net Effect of Exchange Rate Changes on Cash and Cash Equivalents		0	0	(14)
Net Increase (Decrease) in Cash and Cash Equivalents		11,287	5,872	(5,499)
Cash and Cash Equivalents, Beginning of Year		9,859	3,987	9,500
Cash and Cash Equivalents, End of Year		21,146	9,859	3,987
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Paid, Net of Interest Expense Capitalized in Connection with Development Activity		56,844	63,600	66,452
Interest Expense Capitalized in Connection with Development Activity		4,353	3,523	2,453
Income Taxes Paid		769	1,358	23
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable		27,016	23,434	14,812
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		0	0	0
Assumption of Indebtedness and Other Liabilities in Connection with the Acquisition of Real Estate		1,269	5,405	2,090
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate		38,597	32,712	25,747
Write-off of Fully Depreciated Assets		(35,560)	(44,080)	(45,457)
Noncontrolling Interest
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		(364)	(2,862)	(673)
Common Stock
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		0	3	1
Additional Paid-in- Capital
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		364	2,859	672
First Industrial, L.P.
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income		208,301	125,684	76,820
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation		94,078	95,514	92,955
Amortization of Debt Issuance Costs		3,162	3,219	3,159
Other Amortization, including Stock Based Compensation		29,252	28,403	28,359
Impairment of Real Estate		0	0	626
Provision for Bad Debt		177	563	954
Gain on Sale of Real Estate		(131,269)	(68,202)	(48,906)
Loss from Retirement of Debt		1,775	0	0
Mark-to-Market Loss on Interest Rate Protection Agreements		0	0	11,546
(Increase) Decrease in Tenant Accounts Receivable, Prepaid Expenses and Other Assets, Net		(5,510)	1,242	(2,673)
Increase in Deferred Rent Receivable, Net		(5,299)	(6,602)	(6,181)
(Decrease) Increase in Accounts Payable, Accrued Expenses, Other Liabilities, Rents Received in Advance and Security Deposits		(465)	(5,655)	5,682
Payments of Discounts and Prepayment Penalties Associated with Retirement of Debt		(1,453)	(554)	0
Gain on Casualty and Involuntary Conversion		(1,321)	0	0
Other Operating Activity		0	0	(55)
Net Cash Provided by Operating Activities		191,428	173,612	162,286
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions of Real Estate		(175,303)	(107,484)	(168,122)
Additions to Investment in Real Estate and Non-Acquisition Tenant Improvements and Lease Costs		(146,003)	(179,994)	(150,079)
Net Proceeds from Sales of Investments in Real Estate		228,102	163,435	154,024
Proceeds from Casualty and Involuntary Conversion		10,094	0	0
Settlement of Interest Rate Protection Agreements		0	0	(11,546)
(Increase) Decrease in Escrows		(13,169)	13,008	(24,037)
Other Investing Activity		51	43	2,686
Net Cash Used in Investing Activities		(96,228)	(110,992)	(197,074)
CASH FLOWS FROM FINANCING ACTIVITIES:
Debt and Equity Issuance Costs		(6,864)	(375)	(5,158)
Proceeds from the Issuance of Common Stock/Contribution of General Partner Units		74,880	124,936	0
Repurchase and Retirement of Restricted Stock/Units		(2,401)	(5,242)	(2,101)
Common Stock Dividends and Unit Distributions Paid		(100,524)	(82,696)	(55,811)
Contributions from Noncontrolling Interests		40	123	67
Distributions to Noncontrolling Interests		(360)	(400)	(189)
Repayments on Mortgage Loans Payable		(46,832)	(70,969)	(35,004)
Proceeds from Senior Unsecured Notes		200,000	0	0
Repayments of Senior Unsecured Notes		(156,852)	(159,125)	0
Proceeds from Unsecured Term Loans		0	0	260,000
Proceeds from Unsecured Credit Facility		429,000	442,000	321,500
Repayments on Unsecured Credit Facility		(474,000)	(305,000)	(454,000)
Net Cash (Used in) Provided by Financing Activities		(83,913)	(56,748)	29,304
Net Effect of Exchange Rate Changes on Cash and Cash Equivalents		0	0	(14)
Net Increase (Decrease) in Cash and Cash Equivalents		11,287	5,872	(5,484)
Cash and Cash Equivalents, Beginning of Year		9,859	3,987	9,485
Cash and Cash Equivalents, End of Year		21,146	9,859	3,987
SUPPLEMENTAL INFORMATION TO STATEMENTS OF CASH FLOWS:
Interest Paid, Net of Interest Expense Capitalized in Connection with Development Activity		56,844	63,600	66,452
Interest Expense Capitalized in Connection with Development Activity		4,353	3,523	2,453
Income Taxes Paid		769	1,358	23
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Dividends and Distributions Payable		27,016	23,434	14,812
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		0	0	0
Assumption of Indebtedness and Other Liabilities in Connection with the Acquisition of Real Estate		1,269	5,405	2,090
Accounts Payable Related to Construction in Progress and Additions to Investment in Real Estate		38,597	32,712	25,747
Write-off of Fully Depreciated Assets		(35,560)	(44,080)	(45,457)
First Industrial, L.P. | Limited Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income		6,845	4,452	2,903
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		(364)	(2,862)	(673)
First Industrial, L.P. | General Partner Units
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income		201,313	121,095	73,779
Exchange of Limited Partner Units for Common Stock/General Partner Units
Conversion of Limited Partner Units to Common Stock / General Partner Units		$ 364	$ 2,862	$ 673

[1] (A) Gross proceeds and gain on sale of real estate includes the sale of several land parcels for the years ended December 31, 2017 and 2015.