Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 269,319	$ 1,298,548
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	126,039	124,883
Amortization of deferred leasing and other costs	27,322	30,002
Amortization of deferred financing costs	2,840	2,672
Straight-line rental income and expense, net	(10,931)	(7,722)
Impairment charges	0	859
Loss on debt extinguishment	151	9,536
Gains on land and depreciated property sales	(201,175)	(1,183,262)
Third-party construction contracts, net	(5,122)	(1,945)
Other accrued revenues and expenses, net	24,760	4,068
Equity in earnings (in excess of) or less than operating distributions received from unconsolidated joint ventures	(2,585)	(46,303)
Net cash provided by operating activities	230,618	231,336
Cash flows from investing activities:
Development of real estate investments	(227,186)	(288,833)
Acquisition of real estate investments and related intangible assets	(208,914)	(237,472)
Acquisition of undeveloped land	(98,486)	(67,923)
Second generation tenant improvements, leasing costs and building improvements	(26,337)	(20,112)
Other deferred leasing costs	(20,787)	(16,091)
Other assets	145,300	18,648
Proceeds from land and depreciated property sales, net	433,551	1,977,127
Capital distributions from unconsolidated joint ventures	17,439	111,557
Capital contributions and advances to unconsolidated joint ventures	(2,617)	(2,039)
Net cash provided by investing activities	11,963	1,474,862
Cash flows from financing activities:
Proceeds from issuance of common shares, net	1,376	3,690
Payments on unsecured debt	(1,322)	(545,924)
Payments on secured indebtedness including principal amortization	(5,708)	(46,123)
Borrowings on line of credit, net	0	(48,000)
Distributions to common shareholders/unitholders	(142,807)	(135,131)
Distributions to noncontrolling Interest	(1,361)	(1,298)
Tax payments on stock-based compensation awards	(8,128)	(9,003)
Change in book cash overdrafts	(35,331)	(13,470)
Deferred financing costs	(285)	(8)
Net cash used for financing activities	(193,566)	(795,267)
Net increase in cash, cash equivalents and restricted cash	49,015	910,931
Cash, cash equivalents and restricted cash at beginning of period	193,627	57,038
Cash, cash equivalents and restricted cash at end of period	242,642	967,969
Noncash investing and financing activities:
Carrying amounts of pre-existing ownership interest in acquired property	5,034	0
Notes receivable from buyers in property sales	0	400,000
Conversion of Limited Partner Units to common shares	1,938	1,683
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	269,319	1,298,548
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	126,039	124,883
Amortization of deferred leasing and other costs	27,322	30,002
Amortization of deferred financing costs	2,840	2,672
Straight-line rental income and expense, net	(10,931)	(7,722)
Impairment charges	0	859
Loss on debt extinguishment	151	9,536
Gains on land and depreciated property sales	(201,175)	(1,183,262)
Third-party construction contracts, net	(5,122)	(1,945)
Other accrued revenues and expenses, net	24,760	4,068
Equity in earnings (in excess of) or less than operating distributions received from unconsolidated joint ventures	(2,585)	(46,303)
Net cash provided by operating activities	230,618	231,336
Cash flows from investing activities:
Development of real estate investments	(227,186)	(288,833)
Acquisition of real estate investments and related intangible assets	(208,914)	(237,472)
Acquisition of undeveloped land	(98,486)	(67,923)
Second generation tenant improvements, leasing costs and building improvements	(26,337)	(20,112)
Other deferred leasing costs	(20,787)	(16,091)
Other assets	145,300	18,648
Proceeds from land and depreciated property sales, net	433,551	1,977,127
Capital distributions from unconsolidated joint ventures	17,439	111,557
Capital contributions and advances to unconsolidated joint ventures	(2,617)	(2,039)
Net cash provided by investing activities	11,963	1,474,862
Cash flows from financing activities:
Contributions from the General Partner	1,376	3,690
Payments on unsecured debt	(1,322)	(545,924)
Payments on secured indebtedness including principal amortization	(5,708)	(46,123)
Borrowings on line of credit, net	0	(48,000)
Distributions to common shareholders/unitholders	(144,168)	(136,388)
Distributions to noncontrolling Interest	0	(41)
Tax payments on stock-based compensation awards	(8,128)	(9,003)
Change in book cash overdrafts	(35,331)	(13,470)
Deferred financing costs	(285)	(8)
Net cash used for financing activities	(193,566)	(795,267)
Net increase in cash, cash equivalents and restricted cash	49,015	910,931
Cash, cash equivalents and restricted cash at beginning of period	193,627	57,038
Cash, cash equivalents and restricted cash at end of period	242,642	967,969
Noncash investing and financing activities:
Carrying amounts of pre-existing ownership interest in acquired property	5,034	0
Notes receivable from buyers in property sales	0	400,000
Conversion of Limited Partner Units to common shares	$ 1,938	$ 1,683