Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 322,842	$ 1,464,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	190,460	179,918
Amortization of deferred leasing and other costs	41,756	42,996
Amortization of deferred financing costs	4,303	4,049
Straight-line rental income and expense, net	(16,763)	(12,021)
Impairment charges	0	4,481
Loss on debt extinguishment	240	26,104
Gains on land and depreciated property sales	(205,119)	(1,331,058)
Third-party construction contracts, net	(5,088)	2,679
Other accrued revenues and expenses, net	43,627	25,848
Equity in earnings (in excess of) or less than operating distributions received from unconsolidated joint ventures	(4,609)	(45,298)
Net cash provided by operating activities	371,649	361,873
Cash flows from investing activities:
Development of real estate investments	(459,513)	(421,702)
Acquisition of real estate investments and related intangible assets	(208,914)	(620,869)
Acquisition of undeveloped land	(194,171)	(127,662)
Second generation tenant improvements, leasing costs and building improvements	(34,311)	(34,350)
Other deferred leasing costs	(27,691)	(22,399)
Other assets	(5,929)	(4,886)
Proceeds from Collection of Notes Receivable	149,913	3,628
Proceeds from land and depreciated property sales, net	434,584	2,283,917
Capital distributions from unconsolidated joint ventures	19,176	111,635
Capital contributions and advances to unconsolidated joint ventures	(2,728)	(6,303)
Net cash (used for) provided by investing activities	(329,584)	1,161,009
Cash flows from financing activities:
Proceeds from issuance of common shares, net	30,591	7,309
Proceeds from Issuance of Unsecured Debt	450,000
Payments on unsecured debt	(1,998)	(691,492)
Payments on secured indebtedness including principal amortization	(231,070)	(71,154)
Repayments on line of credit, net	0	(43,000)
Distributions to common shareholders/unitholders	(214,463)	(202,770)
Distributions to noncontrolling Interest	(1,746)	(8,407)
Tax payments on stock-based compensation awards	(8,389)	(14,868)
Change in book cash overdrafts	22,669	11,245
Deferred financing costs	(8,485)	(16)
Redemption of Limited Partner Units	0	(457)
Net cash provided by (used for) financing activities	37,109	(1,013,610)
Net increase in cash, cash equivalents and restricted cash	79,174	509,272
Cash, cash equivalents and restricted cash at beginning of period	193,627	57,038
Cash, cash equivalents and restricted cash at end of period	272,801	566,310
Noncash investing and financing activities:
Carrying amounts of pre-existing ownership interest in acquired property	5,034	0
Non-Cash Property Contribution from Noncontrolling Interest - NonCash Disclosure	3,200	0
Notes receivable from buyers in property sales	0	404,846
Conversion of Limited Partner Units to common shares	1,967	1,714
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	322,842	1,464,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	190,460	179,918
Amortization of deferred leasing and other costs	41,756	42,996
Amortization of deferred financing costs	4,303	4,049
Straight-line rental income and expense, net	(16,763)	(12,021)
Impairment charges	0	4,481
Loss on debt extinguishment	240	26,104
Gains on land and depreciated property sales	(205,119)	(1,331,058)
Third-party construction contracts, net	(5,088)	2,679
Other accrued revenues and expenses, net	43,627	25,848
Equity in earnings (in excess of) or less than operating distributions received from unconsolidated joint ventures	(4,609)	(45,298)
Net cash provided by operating activities	371,649	361,873
Cash flows from investing activities:
Development of real estate investments	(459,513)	(421,702)
Acquisition of real estate investments and related intangible assets	(208,914)	(620,869)
Acquisition of undeveloped land	(194,171)	(127,662)
Second generation tenant improvements, leasing costs and building improvements	(34,311)	(34,350)
Other deferred leasing costs	(27,691)	(22,399)
Other assets	(5,929)	(4,886)
Proceeds from Collection of Notes Receivable	149,913	3,628
Proceeds from land and depreciated property sales, net	434,584	2,283,917
Capital distributions from unconsolidated joint ventures	19,176	111,635
Capital contributions and advances to unconsolidated joint ventures	(2,728)	(6,303)
Net cash (used for) provided by investing activities	(329,584)	1,161,009
Cash flows from financing activities:
Contributions from the General Partner	30,591	7,309
Proceeds from Issuance of Unsecured Debt	450,000	0
Payments on unsecured debt	(1,998)	(691,492)
Payments on secured indebtedness including principal amortization	(231,070)	(71,154)
Repayments on line of credit, net	0	(43,000)
Distributions to common shareholders/unitholders	(216,484)	(204,654)
Distributions to noncontrolling Interest	275	(6,523)
Tax payments on stock-based compensation awards	(8,389)	(14,868)
Change in book cash overdrafts	22,669	11,245
Deferred financing costs	(8,485)	(16)
Redemption of Limited Partner Units	0	(457)
Net cash provided by (used for) financing activities	37,109	(1,013,610)
Net increase in cash, cash equivalents and restricted cash	79,174	509,272
Cash, cash equivalents and restricted cash at beginning of period	193,627	57,038
Cash, cash equivalents and restricted cash at end of period	272,801	566,310
Noncash investing and financing activities:
Carrying amounts of pre-existing ownership interest in acquired property	5,034	0
Non-Cash Property Contribution from Noncontrolling Interest - NonCash Disclosure	3,200	0
Notes receivable from buyers in property sales	0	404,846
Conversion of Limited Partner Units to common shares	$ 1,967	$ 1,714