Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 73,648	$ 70,781
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	63,944	66,172
Amortization of deferred leasing and other costs	13,585	15,385
Amortization of deferred financing costs	1,418	1,316
Straight-line rental income and expense, net	(6,288)	(2,928)
Impairment charges	0	859
Loss on debt extinguishment	0	(25)
Gains on land and depreciated property sales	(47,967)	(38,551)
Third-party construction contracts, net	(367)	714
Other accrued revenues and expenses, net	19,862	(3,733)
Operating distributions received less than equity in earnings from unconsolidated joint ventures	(4,673)	(282)
Net cash provided by operating activities	113,162	109,708
Cash flows from investing activities:
Development of real estate investments	(104,346)	(112,727)
Acquisition of real estate investments and related intangible assets	(22,801)	(114,369)
Acquisition of undeveloped land	(67,256)	(50,436)
Second generation tenant improvements, leasing costs and building improvements	(14,102)	(10,431)
Other deferred leasing costs	(9,798)	(4,398)
Other assets	39,183	(4,186)
Proceeds from land and depreciated property sales, net	131,380	103,120
Capital distributions from unconsolidated joint ventures	9,404	4,858
Capital contributions and advances to unconsolidated joint ventures	0	(297)
Net cash used for investing activities	(38,336)	(188,866)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	706	786
Payments on unsecured debt	(656)	(616)
Payments on secured indebtedness including principal amortization	(1,345)	(17,539)
Borrowings on line of credit, net	75,000	189,000
Distributions to common shareholders/unitholders	(71,398)	(67,554)
Distributions to Noncontrolling Interest	(680)	(640)
Tax payments on stock-based compensation awards	(7,984)	(8,848)
Change in book overdrafts	(33,448)	7,115
Deferred financing costs	(285)	(7)
Net cash (used for) provided by financing activities	(40,090)	101,697
Net increase in cash, cash equivalents and restricted cash	34,736	22,539
Cash, cash equivalents and restricted cash at beginning of period	193,627	57,038
Cash, cash equivalents and restricted cash at end of period	228,363	79,577
Noncash investing and financing activities:
Conversion of Limited Partner Units to common shares	0	1,685
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	73,648	70,781
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	63,944	66,172
Amortization of deferred leasing and other costs	13,585	15,385
Amortization of deferred financing costs	1,418	1,316
Straight-line rental income and expense, net	(6,288)	(2,928)
Impairment charges	0	859
Loss on debt extinguishment	0	(25)
Gains on land and depreciated property sales	(47,967)	(38,551)
Third-party construction contracts, net	(367)	714
Other accrued revenues and expenses, net	19,862	(3,733)
Operating distributions received less than equity in earnings from unconsolidated joint ventures	(4,673)	(282)
Net cash provided by operating activities	113,162	109,708
Cash flows from investing activities:
Development of real estate investments	(104,346)	(112,727)
Acquisition of real estate investments and related intangible assets	(22,801)	(114,369)
Acquisition of undeveloped land	(67,256)	(50,436)
Second generation tenant improvements, leasing costs and building improvements	(14,102)	(10,431)
Other deferred leasing costs	(9,798)	(4,398)
Other assets	39,183	(4,186)
Proceeds from land and depreciated property sales, net	131,380	103,120
Capital distributions from unconsolidated joint ventures	9,404	4,858
Capital contributions and advances to unconsolidated joint ventures	0	(297)
Net cash used for investing activities	(38,336)	(188,866)
Cash flows from financing activities:
Contributions from the General Partner	706	786
Payments on unsecured debt	(656)	(616)
Payments on secured indebtedness including principal amortization	(1,345)	(17,539)
Borrowings on line of credit, net	75,000	189,000
Distributions to common shareholders/unitholders	(72,078)	(68,184)
Distributions to Noncontrolling Interest	0	(10)
Tax payments on stock-based compensation awards	(7,984)	(8,848)
Change in book overdrafts	(33,448)	7,115
Deferred financing costs	(285)	(7)
Net cash (used for) provided by financing activities	(40,090)	101,697
Net increase in cash, cash equivalents and restricted cash	34,736	22,539
Cash, cash equivalents and restricted cash at beginning of period	193,627	57,038
Cash, cash equivalents and restricted cash at end of period	228,363	79,577
Noncash investing and financing activities:
Conversion of Limited Partner Units to common shares	$ 0	$ 1,685