Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 132,396	$ 345,122
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	219,694	202,261
Amortization of deferred leasing and other costs	40,965	40,659
Amortization of deferred financing costs	6,814	4,606
Straight-line rental income and expense, net	(15,660)	(15,627)
Impairment charges	5,626	0
Loss on debt extinguishment	32,898	13
Gain on involuntary conversion	(4,312)	(2,259)
Gains on land and depreciated property sales	(28,567)	(211,010)
Third-party construction contracts, net	2,017	14,218
Other accrued revenues and expenses, net	42,415	26,870
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	4,656	(766)
Net cash provided by operating activities	438,942	404,087
Cash flows from investing activities:
Development of real estate investments	(469,001)	(325,825)
Payments to Acquire Commercial Real Estate	(85,465)	(146,632)
Acquisition of land and other real estate assets	(96,376)	(223,547)
Second generation tenant improvements, leasing costs and building improvements	(27,733)	(31,644)
Other deferred leasing costs	(29,867)	(28,551)
Other assets	(9,519)	(9,104)
Proceeds from the repayments of notes receivable from property sales	110,000	145,000
Proceeds from land and depreciated property sales, net	55,740	379,774
Proceeds from Equity Method Investment, Distribution, Return of Capital	876	2,664
Capital contributions and advances to unconsolidated joint ventures	(6,161)	(5,963)
Net cash used for investing activities	(557,506)	(243,828)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	119,765	222,672
Proceeds from unsecured debt	663,123	182,284
Payments on unsecured debt	(546,972)	0
Proceeds from secured notes payable	18,400	0
Payments on secured indebtedness including principal amortization	(3,284)	(44,652)
Borrowings (repayments) on line of credit, net	47,000	(30,000)
Distributions to common shareholders/unitholders	(260,431)	(232,323)
Distributions to noncontrolling Interest	(2,149)	(1,864)
Tax payments on stock-based compensation awards	(4,263)	(5,695)
Change in book cash overdrafts	(13,588)	(14,306)
Other Financing Activities	284	(9,920)
Deferred financing costs	(7,354)	(1,440)
Net cash provided by financing activities	10,531	64,756
Net (decrease) increase in cash, cash equivalents and restricted cash	(108,033)	225,015
Cash, cash equivalents and restricted cash at beginning of period	121,431	25,517
Cash, cash equivalents and restricted cash at end of period	13,398	250,532
Noncash activities:
Lease liabilities arising from right-of-use assets	35,956	38,826
Assumption of indebtedness and other liabilities in real estate acquisitions	33,905	0
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	132,396	345,122
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	219,694	202,261
Amortization of deferred leasing and other costs	40,965	40,659
Amortization of deferred financing costs	6,814	4,606
Straight-line rental income and expense, net	(15,660)	(15,627)
Impairment charges	5,626	0
Loss on debt extinguishment	32,898	13
Gain on involuntary conversion	(4,312)	(2,259)
Gains on land and depreciated property sales	(28,567)	(211,010)
Third-party construction contracts, net	2,017	14,218
Other accrued revenues and expenses, net	42,415	26,870
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	4,656	(766)
Net cash provided by operating activities	438,942	404,087
Cash flows from investing activities:
Development of real estate investments	(469,001)	(325,825)
Payments to Acquire Commercial Real Estate	(85,465)	(146,632)
Acquisition of land and other real estate assets	(96,376)	(223,547)
Second generation tenant improvements, leasing costs and building improvements	(27,733)	(31,644)
Other deferred leasing costs	(29,867)	(28,551)
Other assets	(9,519)	(9,104)
Proceeds from the repayments of notes receivable from property sales	110,000	145,000
Proceeds from land and depreciated property sales, net	55,740	379,774
Proceeds from Equity Method Investment, Distribution, Return of Capital	876	2,664
Capital contributions and advances to unconsolidated joint ventures	(6,161)	(5,963)
Net cash used for investing activities	(557,506)	(243,828)
Cash flows from financing activities:
Contributions from the General Partner	119,765	222,672
Proceeds from unsecured debt	663,123	182,284
Payments on unsecured debt	(546,972)	0
Proceeds from secured notes payable	18,400	0
Payments on secured indebtedness including principal amortization	(3,284)	(44,652)
Borrowings (repayments) on line of credit, net	47,000	(30,000)
Distributions to common shareholders/unitholders	(262,780)	(234,352)
Distributions to noncontrolling Interest	200	165
Tax payments on stock-based compensation awards	(4,263)	(5,695)
Change in book cash overdrafts	(13,588)	(14,306)
Other Financing Activities	284	(9,920)
Deferred financing costs	(7,354)	(1,440)
Net cash provided by financing activities	10,531	64,756
Net (decrease) increase in cash, cash equivalents and restricted cash	(108,033)	225,015
Cash, cash equivalents and restricted cash at beginning of period	121,431	25,517
Cash, cash equivalents and restricted cash at end of period	13,398	250,532
Noncash activities:
Lease liabilities arising from right-of-use assets	35,956	38,826
Assumption of indebtedness and other liabilities in real estate acquisitions	$ 33,905	$ 0