Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 757,625	$ 132,396
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	230,323	219,694
Amortization of deferred leasing and other costs	43,012	40,965
Amortization of deferred financing costs	7,285	6,814
Straight-line rental income and expense, net	(22,985)	(15,660)
Impairment charges	0	5,626
Loss on debt extinguishment	17,901	32,898
Gain on involuntary conversion	(3,222)	(4,312)
Gain on land and property sales	(568,546)	(28,567)
Third-party construction contracts, net	(2,749)	2,017
Other accrued revenues and expenses, net	51,936	42,415
Equity in earnings (in excess of) less than operating distributions received from unconsolidated joint ventures	(16,468)	4,656
Net cash provided by operating activities	494,112	438,942
Cash flows from investing activities:
Development of real estate investments	(496,322)	(469,001)
Acquisition of buildings and related intangible assets	(242,914)	(85,465)
Acquisition of land and other real estate assets	(290,019)	(96,376)
Second generation tenant improvements, leasing costs and building improvements	(49,949)	(31,671)
Other deferred leasing costs	(28,189)	(25,929)
Other assets	(68,310)	(9,519)
Proceeds from the repayments of notes receivable from property sales	0	110,000
Proceeds from land and depreciated property sales, net	989,128	55,740
Capital distributions from unconsolidated joint ventures	61,616	876
Capital contributions and advances to unconsolidated joint ventures	(20,158)	(6,161)
Net cash used for investing activities	(145,117)	(557,506)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	311,238	119,765
Proceeds from unsecured debt	446,634	663,123
Payments on unsecured debt	(390,900)	(546,972)
Proceeds from secured debt financings	0	18,400
Payments on secured indebtedness including principal amortization	(3,363)	(3,284)
(Repayments) borrowings on line of credit, net	(139,000)	47,000
Distributions to common shareholders/unitholders	(287,619)	(260,431)
Distributions to noncontrolling Interest	(3,160)	(2,149)
Tax payments on stock-based compensation awards	(4,939)	(4,263)
Change in book cash overdrafts	(6,399)	(13,588)
Other Financing Activities	(249)	284
Deferred financing costs	(10,053)	(7,354)
Redemption of Limited Partner Units	(39)	0
Net cash (used for) provided by financing activities	(87,849)	10,531
Net increase (decrease) in cash, cash equivalents and restricted cash	261,146	(108,033)
Cash, cash equivalents and restricted cash at beginning of period	67,223	121,431
Cash, cash equivalents and restricted cash at end of period	328,369	13,398
Noncash activities:
Lease liabilities arising from right-of-use assets	19,822	35,956
Assumption of indebtedness and other liabilities in real estate acquisitions	84,911	33,905
Contribution of properties to unconsolidated joint venture	74,942	0
Non-cash distribution of assets from unconsolidated joint ventures, net	11,124	0
Issuance of Limited Partner Units for acquisition	11,603	0
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	757,625	132,396
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	230,323	219,694
Amortization of deferred leasing and other costs	43,012	40,965
Amortization of deferred financing costs	7,285	6,814
Straight-line rental income and expense, net	(22,985)	(15,660)
Impairment charges	0	5,626
Loss on debt extinguishment	17,901	32,898
Gain on involuntary conversion	(3,222)	(4,312)
Gain on land and property sales	(568,546)	(28,567)
Third-party construction contracts, net	(2,749)	2,017
Other accrued revenues and expenses, net	51,936	42,415
Equity in earnings (in excess of) less than operating distributions received from unconsolidated joint ventures	(16,468)	4,656
Net cash provided by operating activities	494,112	438,942
Cash flows from investing activities:
Development of real estate investments	(496,322)	(469,001)
Acquisition of buildings and related intangible assets	(242,914)	(85,465)
Acquisition of land and other real estate assets	(290,019)	(96,376)
Second generation tenant improvements, leasing costs and building improvements	(49,949)	(31,671)
Other deferred leasing costs	(28,189)	(25,929)
Other assets	(68,310)	(9,519)
Proceeds from the repayments of notes receivable from property sales	0	110,000
Proceeds from land and depreciated property sales, net	989,128	55,740
Capital distributions from unconsolidated joint ventures	61,616	876
Capital contributions and advances to unconsolidated joint ventures	(20,158)	(6,161)
Net cash used for investing activities	(145,117)	(557,506)
Cash flows from financing activities:
Contributions from the General Partner	311,238	119,765
Proceeds from unsecured debt	446,634	663,123
Payments on unsecured debt	(390,900)	(546,972)
Proceeds from secured debt financings	0	18,400
Payments on secured indebtedness including principal amortization	(3,363)	(3,284)
(Repayments) borrowings on line of credit, net	(139,000)	47,000
Distributions to common shareholders/unitholders	(290,479)	(262,780)
Distributions to noncontrolling Interest	(300)	200
Tax payments on stock-based compensation awards	(4,939)	(4,263)
Change in book cash overdrafts	(6,399)	(13,588)
Other Financing Activities	(249)	284
Deferred financing costs	(10,053)	(7,354)
Redemption of Limited Partner Units	(39)	0
Net cash (used for) provided by financing activities	(87,849)	10,531
Net increase (decrease) in cash, cash equivalents and restricted cash	261,146	(108,033)
Cash, cash equivalents and restricted cash at beginning of period	67,223	121,431
Cash, cash equivalents and restricted cash at end of period	328,369	13,398
Noncash activities:
Lease liabilities arising from right-of-use assets	19,822	35,956
Assumption of indebtedness and other liabilities in real estate acquisitions	84,911	33,905
Contribution of properties to unconsolidated joint venture	74,942	0
Non-cash distribution of assets from unconsolidated joint ventures, net	11,124	0
Issuance of Limited Partner Units for acquisition	$ 11,603	$ 0