Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 345,122	$ 322,842
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	202,261	190,460
Amortization of deferred leasing and other costs	40,659	41,756
Amortization of deferred financing costs	4,606	4,303
Straight-line rental income and expense, net	(15,627)	(16,763)
Loss on debt extinguishment	13	240
Gain on involuntary conversion	(2,259)	0
Gains on land and depreciated property sales	(211,010)	(205,119)
Third-party construction contracts, net	14,218	(5,088)
Other accrued revenues and expenses, net	26,870	43,627
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	(766)	(4,609)
Net cash provided by operating activities	404,087	371,649
Cash flows from investing activities:
Development of real estate investments	(325,825)	(459,513)
Acquisition of real estate investments and related intangible assets	(146,632)	(208,914)
Acquisition of undeveloped land	(223,547)	(194,171)
Second generation tenant improvements, leasing costs and building improvements	(31,644)	(34,311)
Other deferred leasing costs	(28,551)	(27,691)
Other assets	(9,104)	(5,929)
Proceeds from the repayments of notes receivable from property sales	145,000	149,913
Proceeds from land and depreciated property sales, net	379,774	434,584
Capital distributions from unconsolidated joint ventures	2,664	19,176
Capital contributions and advances to unconsolidated joint ventures	(5,963)	(2,728)
Net cash used for investing activities	(243,828)	(329,584)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	222,672	30,591
Proceeds from unsecured debt	182,284	450,000
Payments on unsecured debt	0	(1,998)
Payments on secured indebtedness including principal amortization	(44,652)	(231,070)
Repayments on line of credit, net	(30,000)	0
Distributions to common shareholders/unitholders	(232,323)	(214,463)
Distributions to noncontrolling Interest	(1,864)	(1,746)
Tax payments on stock-based compensation awards	(5,695)	(8,389)
Change in book cash overdrafts	(14,306)	22,669
Other Financing Activities	(9,920)	0
Deferred financing costs	(1,440)	(8,485)
Net cash provided by financing activities	64,756	37,109
Net increase in cash, cash equivalents and restricted cash	225,015	79,174
Cash, cash equivalents and restricted cash at beginning of period	25,517	193,627
Cash, cash equivalents and restricted cash at end of period	250,532	272,801
Noncash activities:
Liabilities and right-of-use assets - operating leases	38,826	0
Investment and Advances Related to Acquisition of Previously Unconsolidated Companies	0	5,034
Contribution of Property	0	3,200
Conversion of Units - NonCash Disclosure	0	1,967
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	345,122	322,842
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	202,261	190,460
Amortization of deferred leasing and other costs	40,659	41,756
Amortization of deferred financing costs	4,606	4,303
Straight-line rental income and expense, net	(15,627)	(16,763)
Loss on debt extinguishment	13	240
Gain on involuntary conversion	(2,259)	0
Gains on land and depreciated property sales	(211,010)	(205,119)
Third-party construction contracts, net	14,218	(5,088)
Other accrued revenues and expenses, net	26,870	43,627
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	(766)	(4,609)
Net cash provided by operating activities	404,087	371,649
Cash flows from investing activities:
Development of real estate investments	(325,825)	(459,513)
Acquisition of real estate investments and related intangible assets	(146,632)	(208,914)
Acquisition of undeveloped land	(223,547)	(194,171)
Second generation tenant improvements, leasing costs and building improvements	(31,644)	(34,311)
Other deferred leasing costs	(28,551)	(27,691)
Other assets	(9,104)	(5,929)
Proceeds from the repayments of notes receivable from property sales	145,000	149,913
Proceeds from land and depreciated property sales, net	379,774	434,584
Capital distributions from unconsolidated joint ventures	2,664	19,176
Capital contributions and advances to unconsolidated joint ventures	(5,963)	(2,728)
Net cash used for investing activities	(243,828)	(329,584)
Cash flows from financing activities:
Proceeds from unsecured debt	182,284	450,000
Contributions from the General Partner	222,672	30,591
Payments on unsecured debt	0	(1,998)
Payments on secured indebtedness including principal amortization	(44,652)	(231,070)
Repayments on line of credit, net	(30,000)	0
Distributions to common shareholders/unitholders	(234,352)	(216,484)
Distributions to noncontrolling Interest	165	275
Tax payments on stock-based compensation awards	(5,695)	(8,389)
Change in book cash overdrafts	(14,306)	22,669
Other Financing Activities	(9,920)	0
Deferred financing costs	(1,440)	(8,485)
Net cash provided by financing activities	64,756	37,109
Net increase in cash, cash equivalents and restricted cash	225,015	79,174
Cash, cash equivalents and restricted cash at beginning of period	25,517	193,627
Cash, cash equivalents and restricted cash at end of period	250,532	272,801
Noncash activities:
Liabilities and right-of-use assets - operating leases	38,826	0
Investment and Advances Related to Acquisition of Previously Unconsolidated Companies	0	5,034
Contribution of Property	0	3,200
Conversion of Units - NonCash Disclosure	$ 0	$ 1,967