Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ 520,134	$ 162,098
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	128,624	144,618
Amortization of deferred leasing and other costs	35,130	51,287
Amortization of deferred financing costs	3,835	5,042
Straight-line rental income and expense, net	(12,775)	(10,892)
Asset Impairment Charges	5,470	2,523
Gains (Losses) on Extinguishment of Debt	82,653	139
Gains on land and depreciated property sales	(571,060)	(107,164)
Third-party construction contracts, net	4,956	(10,209)
Other accrued revenues and expenses, net	(11,924)	11,042
Operating distributions received in excess of (less than) equity in earnings from unconsolidated companies	(9,391)	(44,454)
Net cash provided by operating activities	175,652	204,030
Cash flows from investing activities:
Development of real estate investments	(109,617)	(226,575)
Acquisition of real estate investments and related intangible assets	(20,929)	(85,182)
Acquisition of undeveloped land	(25,579)	(11,800)
Second generation tenant improvements, leasing costs and building improvements	(30,871)	(44,367)
Other deferred leasing costs	(22,302)	(14,980)
Other assets	(94,745)	3,954
Proceeds from land and depreciated property sales, net	1,305,794	213,040
Capital distributions from unconsolidated companies	67,004	40,293
Capital contributions and advances to unconsolidated companies	(50,208)	(4,165)
Net cash provided by (used for) investing activities	1,018,547	(129,782)
Cash flows from financing activities:
Proceeds from issuance of common shares, net	4,756	191,107
Payments for redemption/repurchase of preferred shares/units	0	(17,656)
Payments on unsecured debt	(759,354)	(1,029)
Payments on secured indebtedness including principal amortization	(207,169)	(88,898)
Borrowings (payments) on line of credit, net	(106,000)	(28,000)
Distributions to common shareholders/unitholders	(117,274)	(111,919)
Distributions to preferred shareholders/unitholders	0	(14,186)
Distributions to Noncontrolling Interest, Net	(1,394)	(1,304)
Buyout of noncontrolling interests	0	(7,717)
Change in book overdrafts	(5,322)	7,659
Deferred financing costs	(110)	(355)
Net cash provided by (used for) financing activities	(1,191,867)	(72,298)
Net increase (decrease) in cash and cash equivalents	2,332	1,950
Cash and cash equivalents at beginning of period	17,922	19,275
Cash and cash equivalents at end of period	20,254	21,225
Noncash investing and financing activities:
Assumption of indebtedness and other liabilities in real estate acquisitions	0	54
Mortgage note receivable from buyer in property sale	200,000	0
Conversion of Limited Partner Units to common shares	(1,693)	56
Duke Realty Limited Partnership [Member]
Cash flows from operating activities:
Net income (loss)	520,134	162,098
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	128,624	144,618
Amortization of deferred leasing and other costs	35,130	51,287
Amortization of deferred financing costs	3,835	5,042
Straight-line rental income and expense, net	(12,775)	(10,892)
Asset Impairment Charges	5,470	2,523
Gains (Losses) on Extinguishment of Debt	82,653	139
Gains on land and depreciated property sales	(571,060)	(107,164)
Third-party construction contracts, net	4,956	(10,209)
Other accrued revenues and expenses, net	(11,875)	11,042
Operating distributions received in excess of (less than) equity in earnings from unconsolidated companies	(9,391)	(44,454)
Net cash provided by operating activities	175,701	204,030
Cash flows from investing activities:
Development of real estate investments	(109,617)	(226,575)
Acquisition of real estate investments and related intangible assets	(20,929)	(85,182)
Acquisition of undeveloped land	(25,579)	(11,800)
Second generation tenant improvements, leasing costs and building improvements	(30,871)	(44,367)
Other deferred leasing costs	(22,302)	(14,980)
Other assets	(94,745)	3,954
Proceeds from land and depreciated property sales, net	1,305,794	213,040
Capital distributions from unconsolidated companies	67,004	40,293
Capital contributions and advances to unconsolidated companies	(50,208)	(4,165)
Net cash provided by (used for) investing activities	1,018,547	(129,782)
Cash flows from financing activities:
Contributions from the General Partner	4,707	191,107
Payments for redemption/repurchase of preferred shares/units	0	(17,656)
Payments on unsecured debt	(759,354)	(1,029)
Payments on secured indebtedness including principal amortization	(207,169)	(88,898)
Borrowings (payments) on line of credit, net	(106,000)	(28,000)
Distributions to common shareholders/unitholders	(118,525)	(113,410)
Distributions to preferred shareholders/unitholders	0	(14,186)
Distributions to Noncontrolling Interest, Net	(143)	187
Buyout of noncontrolling interests	0	(7,717)
Change in book overdrafts	(5,322)	7,659
Deferred financing costs	(110)	(355)
Net cash provided by (used for) financing activities	(1,191,916)	(72,298)
Net increase (decrease) in cash and cash equivalents	2,332	1,950
Cash and cash equivalents at beginning of period	17,922	19,275
Cash and cash equivalents at end of period	20,254	21,225
Noncash investing and financing activities:
Assumption of indebtedness and other liabilities in real estate acquisitions	0	54
Mortgage note receivable from buyer in property sale	200,000	0
Conversion of Limited Partner Units to common shares	$ (1,693)	$ 56