Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 116,591	$ 269,319
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	131,878	126,039
Amortization of deferred leasing and other costs	27,118	27,322
Amortization of deferred financing costs	3,121	2,840
Straight-line rental income and expense, net	(10,466)	(10,931)
Loss on debt extinguishment	13	151
Gain on involuntary conversion	(2,259)	0
Gains on land and depreciated property sales	(33,383)	(201,175)
Third-party construction contracts, net	15,645	(5,122)
Other accrued revenues and expenses, net	10,021	24,760
Equity in earnings (in excess of) or less than operating distributions received from unconsolidated joint ventures	(487)	(2,585)
Net cash provided by operating activities	257,792	230,618
Cash flows from investing activities:
Development of real estate investments	(205,315)	(227,186)
Acquisition of real estate investments and related intangible assets	(108,201)	(208,914)
Acquisition of undeveloped land	(200,872)	(98,486)
Second generation tenant improvements, leasing costs and building improvements	(20,463)	(26,337)
Other deferred leasing costs	(11,152)	(20,787)
Other assets	(7,224)	(4,590)
Proceeds from the repayments of notes receivable from property sales	130,000	149,890
Proceeds from land and depreciated property sales, net	97,526	433,551
Capital distributions from unconsolidated joint ventures	0	17,439
Capital contributions and advances to unconsolidated joint ventures	(5,962)	(2,617)
Net cash (used for) provided by investing activities	(331,663)	11,963
Cash flows from financing activities:
Proceeds from issuance of common shares, net	42,128	1,376
Payments on unsecured debt	0	(1,322)
Payments on secured indebtedness including principal amortization	(43,502)	(5,708)
Borrowings on line of credit, net	222,000	0
Distributions to common shareholders/unitholders	(154,550)	(142,807)
Distributions to noncontrolling Interest	(1,180)	(1,361)
Tax payments on stock-based compensation awards	(5,469)	(8,128)
Change in book cash overdrafts	15,874	(35,331)
Proceeds from (Payments for) Other Financing Activities	(9,920)	0
Deferred financing costs	0	(285)
Net cash provided by (used for) financing activities	65,381	(193,566)
Net (decrease) increase in cash, cash equivalents and restricted cash	(8,490)	49,015
Cash, cash equivalents and restricted cash at beginning of period	25,517	193,627
Cash, cash equivalents and restricted cash at end of period	17,027	242,642
Noncash operating activities:
Liabilities and right-of-use assets - operating leases	37,810	0
Investment and Advances Related to Acquisition of Previously Unconsolidated Companies	0	5,034
Conversion of Units - NonCash Disclosure	0	1,938
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income	116,591	269,319
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	131,878	126,039
Amortization of deferred leasing and other costs	27,118	27,322
Amortization of deferred financing costs	3,121	2,840
Straight-line rental income and expense, net	(10,466)	(10,931)
Loss on debt extinguishment	13	151
Gain on involuntary conversion	(2,259)	0
Gains on land and depreciated property sales	(33,383)	(201,175)
Third-party construction contracts, net	15,645	(5,122)
Other accrued revenues and expenses, net	10,021	24,760
Equity in earnings (in excess of) or less than operating distributions received from unconsolidated joint ventures	(487)	(2,585)
Net cash provided by operating activities	257,792	230,618
Cash flows from investing activities:
Development of real estate investments	(205,315)	(227,186)
Acquisition of real estate investments and related intangible assets	(108,201)	(208,914)
Acquisition of undeveloped land	(200,872)	(98,486)
Second generation tenant improvements, leasing costs and building improvements	(20,463)	(26,337)
Other deferred leasing costs	(11,152)	(20,787)
Other assets	(7,224)	(4,590)
Proceeds from the repayments of notes receivable from property sales	130,000	149,890
Proceeds from land and depreciated property sales, net	97,526	433,551
Capital distributions from unconsolidated joint ventures	0	17,439
Capital contributions and advances to unconsolidated joint ventures	(5,962)	(2,617)
Net cash (used for) provided by investing activities	(331,663)	11,963
Cash flows from financing activities:
Contributions from the General Partner	42,128	1,376
Payments on unsecured debt	0	(1,322)
Payments on secured indebtedness including principal amortization	(43,502)	(5,708)
Borrowings on line of credit, net	222,000	0
Distributions to common shareholders/unitholders	(155,903)	(144,168)
Distributions to noncontrolling Interest	173	0
Tax payments on stock-based compensation awards	(5,469)	(8,128)
Change in book cash overdrafts	15,874	(35,331)
Proceeds from (Payments for) Other Financing Activities	(9,920)	0
Deferred financing costs	0	(285)
Net cash provided by (used for) financing activities	65,381	(193,566)
Net (decrease) increase in cash, cash equivalents and restricted cash	(8,490)	49,015
Cash, cash equivalents and restricted cash at beginning of period	25,517	193,627
Cash, cash equivalents and restricted cash at end of period	17,027	242,642
Noncash operating activities:
Liabilities and right-of-use assets - operating leases	37,810	0
Investment and Advances Related to Acquisition of Previously Unconsolidated Companies	0	5,034
Conversion of Units - NonCash Disclosure	$ 0	$ 1,938