Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 80,204	$ 19,660
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	79,062	71,582
Amortization of deferred leasing and other costs	14,511	13,777
Amortization of deferred financing costs	2,439	2,219
Straight-line rental income and expense, net	(8,021)	(1,703)
Impairment charges	0	5,626
Loss on debt extinguishment	70	17,806
Gains on land and depreciated property sales	(22,598)	(9,120)
Third-party construction contracts, net	749	(780)
Other accrued revenues and expenses, net	14,651	(6,738)
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	(10,925)	2,221
Net cash provided by operating activities	150,142	114,550
Cash flows from investing activities:
Development of real estate investments	(140,432)	(170,900)
Payments to Acquire Commercial Real Estate	(34,738)	0
Acquisition of land and other real estate assets	(64,594)	(87,023)
Second generation tenant improvements, leasing costs and building improvements	(14,676)	(8,105)
Other deferred leasing costs	(8,007)	(12,341)
Other assets	(36,844)	(15,040)
Proceeds from the repayments of notes receivable from property sales	0	110,000
Proceeds from land and depreciated property sales, net	85,479	27,081
Capital distributions from unconsolidated joint ventures	3,532	0
Capital contributions and advances to unconsolidated joint ventures	0	(2,353)
Net cash used for investing activities	(210,280)	(158,681)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	30,381	5,465
Proceeds from unsecured debt	446,634	316,371
Payments on unsecured debt	(40,226)	(316,655)
Proceeds from secured notes payable	0	18,400
Payments on secured indebtedness including principal amortization	(1,007)	(876)
(Repayments) borrowings on line of credit, net	(295,000)	200,000
Distributions to common shareholders/unitholders	(95,310)	(86,562)
Distributions to noncontrolling Interest	(1,092)	(783)
Tax payments on stock-based compensation awards	(4,754)	(4,051)
Change in book cash overdrafts	(14,430)	(14,444)
Other Financing Activities	(270)	289
Deferred financing costs	(9,800)	(3,971)
Net cash provided by financing activities	15,126	113,183
Net (decrease) increase in cash, cash equivalents and restricted cash	(45,012)	69,052
Cash, cash equivalents and restricted cash at beginning of period	67,223	121,431
Cash, cash equivalents and restricted cash at end of period	22,211	190,483
Noncash activities:
Lease liabilities arising from right-of-use assets	18,257	1,132
Assumption of indebtedness in real estate acquisitions	40,226	0
Non-cash distribution of assets from unconsolidated joint ventures, net	11,023	0
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	80,204	19,660
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	79,062	71,582
Amortization of deferred leasing and other costs	14,511	13,777
Amortization of deferred financing costs	2,439	2,219
Straight-line rental income and expense, net	(8,021)	(1,703)
Impairment charges	0	5,626
Loss on debt extinguishment	70	17,806
Gains on land and depreciated property sales	(22,598)	(9,120)
Third-party construction contracts, net	749	(780)
Other accrued revenues and expenses, net	14,651	(6,738)
Equity in earnings in excess of operating distributions received from unconsolidated joint ventures	(10,925)	2,221
Net cash provided by operating activities	150,142	114,550
Cash flows from investing activities:
Development of real estate investments	(140,432)	(170,900)
Payments to Acquire Commercial Real Estate	(34,738)	0
Acquisition of land and other real estate assets	(64,594)	(87,023)
Second generation tenant improvements, leasing costs and building improvements	(14,676)	(8,105)
Other deferred leasing costs	(8,007)	(12,341)
Other assets	(36,844)	(15,040)
Proceeds from the repayments of notes receivable from property sales	0	110,000
Proceeds from land and depreciated property sales, net	85,479	27,081
Capital distributions from unconsolidated joint ventures	3,532	0
Capital contributions and advances to unconsolidated joint ventures	0	(2,353)
Net cash used for investing activities	(210,280)	(158,681)
Cash flows from financing activities:
Contributions from the General Partner	30,381	5,465
Proceeds from unsecured debt	446,634	316,371
Payments on unsecured debt	(40,226)	(316,655)
Proceeds from secured notes payable	0	18,400
Payments on secured indebtedness including principal amortization	(1,007)	(876)
(Repayments) borrowings on line of credit, net	(295,000)	200,000
Distributions to common shareholders/unitholders	(96,252)	(87,345)
Distributions to noncontrolling Interest	(150)	0
Tax payments on stock-based compensation awards	(4,754)	(4,051)
Change in book cash overdrafts	(14,430)	(14,444)
Other Financing Activities	(270)	289
Deferred financing costs	(9,800)	(3,971)
Net cash provided by financing activities	15,126	113,183
Net (decrease) increase in cash, cash equivalents and restricted cash	(45,012)	69,052
Cash, cash equivalents and restricted cash at beginning of period	67,223	121,431
Cash, cash equivalents and restricted cash at end of period	22,211	190,483
Noncash activities:
Lease liabilities arising from right-of-use assets	18,257	1,132
Assumption of indebtedness in real estate acquisitions	40,226	0
Non-cash distribution of assets from unconsolidated joint ventures, net	$ 11,023	$ 0