Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 257,860	$ 59,880
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	156,470	143,922
Amortization of deferred leasing and other costs	28,832	28,141
Amortization of deferred financing costs	4,888	4,477
Straight-line rental income and expense, net	(14,497)	(8,476)
Impairment charges	0	5,626
Loss on debt extinguishment	4,008	32,778
Gain on involuntary conversion	(3,222)	(1,283)
Gain on land and property sales	(127,681)	(15,213)
Third-party construction contracts, net	(1,588)	(3,717)
Other accrued revenues and expenses, net	23,993	11,460
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	(17,113)	3,563
Net cash provided by operating activities	311,950	261,158
Cash flows from investing activities:
Development of real estate investments	(332,091)	(333,212)
Acquisition of buildings and related intangible assets	(218,788)	0
Acquisition of land and other real estate assets	(223,280)	(95,859)
Second generation tenant improvements, leasing costs and building improvements	(33,747)	(17,666)
Other deferred leasing costs	(16,448)	(16,702)
Other assets	(48,736)	(10,289)
Proceeds from the repayments of notes receivable from property sales	0	110,000
Proceeds from land and depreciated property sales, net	265,973	34,509
Capital distributions from unconsolidated joint ventures	20,503	13
Capital contributions and advances to unconsolidated joint ventures	(8,986)	(4,833)
Net cash used for investing activities	(595,600)	(334,039)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	187,217	76,678
Proceeds from unsecured debt	446,634	663,123
Payments on unsecured debt	(127,758)	(546,972)
Proceeds from secured debt financings	0	18,400
Payments on secured indebtedness including principal amortization	(2,028)	(1,906)
Repayments on line of credit, net	(30,000)	0
Distributions to common shareholders/unitholders	(191,082)	(173,131)
Distributions to noncontrolling Interest	(2,116)	(1,566)
Tax payments on stock-based compensation awards	(4,757)	(4,051)
Change in book cash overdrafts	3,758	(14,444)
Other Financing Activities	(270)	289
Deferred financing costs	(9,961)	(6,374)
Payments to Noncontrolling Interests	(37)	0
Net cash provided by financing activities	269,600	10,046
Net decrease in cash, cash equivalents and restricted cash	(14,050)	(62,835)
Cash, cash equivalents and restricted cash at beginning of period	67,223	121,431
Cash, cash equivalents and restricted cash at end of period	53,173	58,596
Noncash activities:
Lease liabilities arising from right-of-use assets	18,257	1,443
Assumption of indebtedness and other liabilities in real estate acquisitions	84,354	0
Non-cash distribution of assets from unconsolidated joint ventures, net	11,124	0
Issuance of Limited Partner Units for acquisition	11,576	0
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	257,860	59,880
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	156,470	143,922
Amortization of deferred leasing and other costs	28,832	28,141
Amortization of deferred financing costs	4,888	4,477
Straight-line rental income and expense, net	(14,497)	(8,476)
Impairment charges	0	5,626
Loss on debt extinguishment	4,008	32,778
Gain on involuntary conversion	(3,222)	(1,283)
Gain on land and property sales	(127,681)	(15,213)
Third-party construction contracts, net	(1,588)	(3,717)
Other accrued revenues and expenses, net	23,993	11,460
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	(17,113)	3,563
Net cash provided by operating activities	311,950	261,158
Cash flows from investing activities:
Development of real estate investments	(332,091)	(333,212)
Acquisition of buildings and related intangible assets	(218,788)	0
Acquisition of land and other real estate assets	(223,280)	(95,859)
Second generation tenant improvements, leasing costs and building improvements	(33,747)	(17,666)
Other deferred leasing costs	(16,448)	(16,702)
Other assets	(48,736)	(10,289)
Proceeds from the repayments of notes receivable from property sales	0	110,000
Proceeds from land and depreciated property sales, net	265,973	34,509
Capital distributions from unconsolidated joint ventures	20,503	13
Capital contributions and advances to unconsolidated joint ventures	(8,986)	(4,833)
Net cash used for investing activities	(595,600)	(334,039)
Cash flows from financing activities:
Contributions from the General Partner	187,217	76,678
Proceeds from unsecured debt	446,634	663,123
Payments on unsecured debt	(127,758)	(546,972)
Proceeds from secured debt financings	0	18,400
Payments on secured indebtedness including principal amortization	(2,028)	(1,906)
Repayments on line of credit, net	(30,000)	0
Distributions to common shareholders/unitholders	(192,983)	(174,697)
Distributions to noncontrolling Interest	(215)	0
Tax payments on stock-based compensation awards	(4,757)	(4,051)
Change in book cash overdrafts	3,758	(14,444)
Other Financing Activities	(270)	289
Deferred financing costs	(9,961)	(6,374)
Payments to Noncontrolling Interests	(37)	0
Net cash provided by financing activities	269,600	10,046
Net decrease in cash, cash equivalents and restricted cash	(14,050)	(62,835)
Cash, cash equivalents and restricted cash at beginning of period	67,223	121,431
Cash, cash equivalents and restricted cash at end of period	53,173	58,596
Noncash activities:
Lease liabilities arising from right-of-use assets	18,257	1,443
Assumption of indebtedness and other liabilities in real estate acquisitions	84,354	0
Non-cash distribution of assets from unconsolidated joint ventures, net	11,124	0
Issuance of Limited Partner Units for acquisition	$ 11,576	$ 0