Duke Realty Limited PARTNERSHIP 10-Q 31 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Entity Information [Line Items]	'	'
Entity Registrant Name	'DUKE REALTY CORP	'
Entity Central Index Key	'0000783280	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	341,714,410
Duke Realty Limited Partnership [Member]	'	'
Entity Information [Line Items]	'	'
Entity Registrant Name	'DUKE REALTY LIMITED PARTNERSHIP/	'
Entity Central Index Key	'0001003410	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Land and improvements	$1,477,680	$1,438,007
Buildings and tenant improvements	5,640,103	5,531,726
Construction in progress	384,807	256,895
Investments in and advances to unconsolidated companies	316,015	342,947
Undeveloped land	542,490	590,052
Real estate investment property, at cost, total	8,361,095	8,159,627
Accumulated depreciation	-1,464,968	-1,368,406
Net real estate investments	6,896,127	6,791,221
Real estate investments and other assets held-for-sale	35,414	57,466
Cash and cash equivalents	66,132	19,275
Accounts receivable, net of allowance	32,416	26,173
Straight-line rent receivable, net of allowance	131,209	118,251
Receivables on construction contracts, including retentions	30,446	19,209
Deferred financing costs, net of accumulated amortization	28,425	36,250
Deferred leasing and other costs, net of accumulated amortization	441,338	466,979
Escrow deposits and other assets	222,688	217,790
Total Assets	7,884,195	7,752,614
LIABILITIES AND EQUITY	'	'
Secured debt	1,003,851	1,100,124
Unsecured debt	3,064,696	3,066,252
Unsecured line of credit	140,000	88,000
Long-term debt, total	4,208,547	4,254,376
Liabilities related to real estate investments held-for-sale	705	2,075
Construction payables and amounts due subcontractors, including retentions	93,080	69,380
Accrued real estate taxes	103,573	74,696
Accrued interest	34,086	52,824
Other accrued expenses	45,353	67,495
Other liabilities	121,249	142,589
Tenant security deposits and prepaid rents	48,392	44,550
Total Liabilities	4,654,985	4,707,985
Equity	'	'
Preferred shares	332,794	447,683
Common shares	3,417	3,264
Additional paid-in capital	4,891,763	4,620,964
Accumulated other comprehensive income	3,313	4,119
Distributions in excess of net income	-2,029,080	-2,062,787
Total shareholders' equity	3,202,207	3,013,243
Noncontrolling interests	27,003	31,386
Total Equity	3,229,210	3,044,629
Total Liabilities and Equity	7,884,195	7,752,614
Duke Realty Limited Partnership [Member]	'	'
ASSETS	'	'
Land and improvements	1,477,680	1,438,007
Buildings and tenant improvements	5,640,103	5,531,726
Construction in progress	384,807	256,895
Investments in and advances to unconsolidated companies	316,015	342,947
Undeveloped land	542,490	590,052
Real estate investment property, at cost, total	8,361,095	8,159,627
Accumulated depreciation	-1,464,968	-1,368,406
Net real estate investments	6,896,127	6,791,221
Real estate investments and other assets held-for-sale	35,414	57,466
Cash and cash equivalents	66,132	19,275
Accounts receivable, net of allowance	32,416	26,173
Straight-line rent receivable, net of allowance	131,209	118,251
Receivables on construction contracts, including retentions	30,446	19,209
Deferred financing costs, net of accumulated amortization	28,425	36,250
Deferred leasing and other costs, net of accumulated amortization	441,338	466,979
Escrow deposits and other assets	222,688	217,790
Total Assets	7,884,195	7,752,614
LIABILITIES AND EQUITY	'	'
Secured debt	1,003,851	1,100,124
Unsecured debt	3,064,696	3,066,252
Unsecured line of credit	140,000	88,000
Long-term debt, total	4,208,547	4,254,376
Liabilities related to real estate investments held-for-sale	705	2,075
Construction payables and amounts due subcontractors, including retentions	93,080	69,380
Accrued real estate taxes	103,573	74,696
Accrued interest	34,086	52,824
Other accrued expenses	45,597	67,739
Other liabilities	121,249	142,589
Tenant security deposits and prepaid rents	48,392	44,550
Total Liabilities	4,655,229	4,708,229
Equity	'	'
Common equity	2,870,038	2,565,370
Preferred equity	332,785	447,683
General Partners' equity	3,202,823	3,013,053
Limited Partners' common equity	20,625	20,158
Accumulated other comprehensive income	3,313	4,119
Total partners' equity	3,226,761	3,037,330
Noncontrolling interests	2,205	7,055
Total Equity	3,228,966	3,044,385
Total Liabilities and Equity	$7,884,195	$7,752,614

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Accounts receivable, allowance	$2,586	$1,576
Straight-line rent receivable, allowance	7,074	9,350
Deferred financing costs, accumulated amortization	44,370	37,016
Deferred leasing and other costs, accumulated amortization	266,276	394,049
Preferred shares, par value	$0.01	$0.01
Preferred shares, shares authorized	5,000,000	5,000,000
Preferred shares, shares issued	1,331,000	1,791,000
Preferred shares, shares outstanding	1,331,000	1,791,000
Common shares, par value	$0.01	$0.01
Common shares, shares authorized	600,000,000	400,000,000
Common shares, shares issued	341,710,000	326,399,000
Common shares, shares outstanding	341,710,000	326,399,000
Duke Realty Limited Partnership [Member]	'	'
Accounts receivable, allowance	2,586	1,576
Straight-line rent receivable, allowance	7,074	9,350
Deferred financing costs, accumulated amortization	44,370	37,016
Deferred leasing and other costs, accumulated amortization	$266,276	$394,049
Common equity, General Partner Units issued	341,710,000	326,399,000
Common equity, General Partner Units outstanding	341,710,000	326,399,000
Preferred Units, Issued	1,331,000	1,791,000
Preferred Units, Outstanding	1,331,000	1,791,000
Limited Partner Units issued	4,377,000	4,387,000
Limited Partner Units outstanding	4,377,000	4,387,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:	'	'	'	'
Rental and related revenue	$231,322,000	$221,655,000	$702,190,000	$646,842,000
General contractor and service fee revenue	59,739,000	62,807,000	185,072,000	161,004,000
Revenues, total	291,061,000	284,462,000	887,262,000	807,846,000
Expenses:	'	'	'	'
Rental expenses	38,317,000	41,159,000	128,522,000	117,450,000
Real estate taxes	32,861,000	29,433,000	97,292,000	88,042,000
General contractor and other services expenses	52,528,000	59,392,000	163,657,000	142,925,000
Depreciation and amortization	95,000,000	101,191,000	290,700,000	289,508,000
Costs and expenses, total	218,706,000	231,175,000	680,171,000	637,925,000
Other operating activities:	'	'	'	'
Equity in earnings (loss) of unconsolidated companies	19,178,000	-27,000	82,325,000	50,442,000
Gain on sale of properties	47,143,000	0	133,617,000	1,108,000
Earnings from sales of land	3,167,000	3,365,000	7,208,000	3,365,000
Undeveloped land carrying costs	-1,773,000	-2,108,000	-5,755,000	-6,837,000
Asset Impairment Charges	-6,368,000	0	-8,891,000	-3,777,000
Other Operating Income (Expense), Net	-56,000	-47,000	-277,000	-150,000
General and administrative expenses	-10,573,000	-10,373,000	-35,632,000	-33,225,000
Other Operating Activities, Net	50,718,000	-9,190,000	172,595,000	10,926,000
Operating income	123,073,000	44,097,000	379,686,000	180,847,000
Other income (expenses):	'	'	'	'
Interest and other income, net	356,000	145,000	936,000	1,219,000
Interest expense	-53,343,000	-56,618,000	-163,479,000	-171,365,000
Gains (Losses) on Extinguishment of Debt	0	0	-139,000	0
Acquisition-related activity	-110,000	-726,000	-871,000	-2,506,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	69,976,000	-13,102,000	216,133,000	8,195,000
Income Tax Benefit (Expense)	442,000	4,500,000	-2,595,000	4,500,000
Income (loss) from continuing operations	70,418,000	-8,602,000	213,538,000	12,695,000
Discontinued operations:	'	'	'	'
Income (loss) before gain on sales	20,000	1,498,000	222,000	1,545,000
Gain on sale of depreciable properties	1,119,000	8,441,000	19,895,000	101,052,000
Income (loss) from discontinued operations	1,139,000	9,939,000	20,117,000	102,597,000
Net income (loss)	71,557,000	1,337,000	233,655,000	115,292,000
Dividends on preferred shares/units	-6,072,000	-7,356,000	-20,155,000	-24,261,000
Adjustments for redemption of preferred shares/units	-3,196,000	0	-2,713,000	-5,932,000
Net (income) loss attributable to noncontrolling interests	-756,000	-48,000	-2,883,000	-1,629,000
Net income (loss) attributable to common shareholders/unitholders	61,533,000	-6,067,000	207,904,000	83,470,000
Basic net income (loss) per common share/unit:	'	'	'	'
Continuing operations attributable to common shareholders/unitholders	$0.18	($0.05)	$0.56	($0.06)
Discontinued operations attributable to common shareholders/unitholders	$0	$0.03	$0.06	$0.31
Total	$0.18	($0.02)	$0.62	$0.25
Diluted net income (loss) per common share/unit:	'	'	'	'
Continuing operations attributable to common shareholders/unitholders	$0.18	($0.05)	$0.56	($0.06)
Discontinued operations attributable to common shareholders/unitholders	$0	$0.03	$0.06	$0.31
Total	$0.18	($0.02)	$0.62	$0.25
Weighted average number of common shares/units outstanding	341,165	324,895	333,393	320,810
Weighted average number of common shares/units and potential dilutive securities	345,826	324,895	338,057	325,380
Comprehensive income (loss):	'	'	'	'
Net income (loss)	71,557,000	1,337,000	233,655,000	115,292,000
Other comprehensive income:	'	'	'	'
Amortization of interest contracts	-287,000	-116,000	-861,000	567,000
Other	0	-54,000	55,000	522,000
Total other comprehensive income	-287,000	-170,000	-806,000	1,089,000
Comprehensive income (loss)	71,270,000	1,167,000	232,849,000	116,381,000
Duke Realty Limited Partnership [Member]	'	'	'	'
Revenues:	'	'	'	'
Rental and related revenue	231,322,000	221,655,000	702,190,000	646,842,000
General contractor and service fee revenue	59,739,000	62,807,000	185,072,000	161,004,000
Revenues, total	291,061,000	284,462,000	887,262,000	807,846,000
Expenses:	'	'	'	'
Rental expenses	38,317,000	41,159,000	128,522,000	117,450,000
Real estate taxes	32,861,000	29,433,000	97,292,000	88,042,000
General contractor and other services expenses	52,528,000	59,392,000	163,657,000	142,925,000
Depreciation and amortization	95,000,000	101,191,000	290,700,000	289,508,000
Costs and expenses, total	218,706,000	231,175,000	680,171,000	637,925,000
Other operating activities:	'	'	'	'
Equity in earnings (loss) of unconsolidated companies	19,178,000	-27,000	82,325,000	50,442,000
Gain on sale of properties	47,143,000	0	133,617,000	1,108,000
Earnings from sales of land	3,167,000	3,365,000	7,208,000	3,365,000
Undeveloped land carrying costs	-1,773,000	-2,108,000	-5,755,000	-6,837,000
Asset Impairment Charges	-6,368,000	0	-8,891,000	-3,777,000
Other Operating Income (Expense), Net	-56,000	-47,000	-277,000	-150,000
General and administrative expenses	-10,573,000	-10,373,000	-35,632,000	-33,225,000
Other Operating Activities, Net	50,718,000	-9,190,000	172,595,000	10,926,000
Operating income	123,073,000	44,097,000	379,686,000	180,847,000
Other income (expenses):	'	'	'	'
Interest and other income, net	356,000	145,000	936,000	1,219,000
Interest expense	-53,343,000	-56,618,000	-163,479,000	-171,365,000
Gains (Losses) on Extinguishment of Debt	0	0	-139,000	0
Acquisition-related activity	-110,000	-726,000	-871,000	-2,506,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	69,976,000	-13,102,000	216,133,000	8,195,000
Income Tax Benefit (Expense)	442,000	4,500,000	-2,595,000	4,500,000
Income (loss) from continuing operations	70,418,000	-8,602,000	213,538,000	12,695,000
Discontinued operations:	'	'	'	'
Income (loss) before gain on sales	20,000	1,498,000	222,000	1,545,000
Gain on sale of depreciable properties	1,119,000	8,441,000	19,895,000	101,052,000
Income (loss) from discontinued operations	1,139,000	9,939,000	20,117,000	102,597,000
Net income (loss)	71,557,000	1,337,000	233,655,000	115,292,000
Dividends on preferred shares/units	-6,072,000	-7,356,000	-20,155,000	-24,261,000
Adjustments for redemption of preferred shares/units	-3,196,000	0	-2,713,000	-5,932,000
Noncontrolling Interest in Net Income (Loss) Joint Venture Partners, NonRedeemable	39,000	-140,000	-145,000	-487,000
Net income (loss) attributable to common shareholders/unitholders	62,328,000	-6,159,000	210,642,000	84,612,000
Basic net income (loss) per common share/unit:	'	'	'	'
Continuing operations attributable to common shareholders/unitholders	$0.18	($0.05)	$0.56	($0.06)
Discontinued operations attributable to common shareholders/unitholders	$0	$0.03	$0.06	$0.31
Total	$0.18	($0.02)	$0.62	$0.25
Diluted net income (loss) per common share/unit:	'	'	'	'
Continuing operations attributable to common shareholders/unitholders	$0.18	($0.05)	$0.56	($0.06)
Discontinued operations attributable to common shareholders/unitholders	$0	$0.03	$0.06	$0.31
Total	$0.18	($0.02)	$0.62	$0.25
Weighted average number of common shares/units outstanding	345,545	329,283	337,777	325,203
Weighted average number of common shares/units and potential dilutive securities	345,826	329,283	338,057	325,380
Comprehensive income (loss):	'	'	'	'
Net income (loss)	71,557,000	1,337,000	233,655,000	115,292,000
Other comprehensive income:	'	'	'	'
Amortization of interest contracts	-287,000	-116,000	-861,000	567,000
Other	0	-54,000	55,000	522,000
Total other comprehensive income	-287,000	-170,000	-806,000	1,089,000
Comprehensive income (loss)	$71,270,000	$1,167,000	$232,849,000	$116,381,000

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net income (loss)	$233,655	$115,292
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Depreciation of buildings and tenant improvements	216,963	214,118
Amortization of deferred leasing and other costs	73,942	89,359
Amortization of deferred financing costs	7,423	9,913
Straight-line rental income and expense, net	-16,419	-12,421
Asset Impairment Charges	8,891	3,777
Gain on acquisitions	0	-962
Gains on land and depreciated property sales	-163,689	-105,525
Third-party construction contracts, net	-4,397	27,117
Other accrued revenues and expenses, net	18,059	11,367
Operating distributions received in excess of (less than) equity in earnings from unconsolidated companies	-53,429	-34,411
Net cash provided by operating activities	320,999	317,624
Cash flows from investing activities:	'	'
Development of real estate investments	-385,088	-320,698
Acquisition of real estate investments and related intangible assets	-94,032	-372,934
Acquisition of undeveloped land	-37,579	-30,101
Second generation tenant improvements, leasing costs and building improvements	-69,475	-60,052
Other deferred leasing costs	-24,948	-26,647
Other assets	514	-14,725
Proceeds from land and depreciated property sales, net	386,215	330,740
Capital distributions from unconsolidated companies	70,054	106,306
Capital contributions and advances to unconsolidated companies	-5,874	-38,959
Net cash provided by (used for) investing activities	-160,213	-427,070
Cash flows from financing activities:	'	'
Proceeds from issuance of common shares, net	255,962	632,531
Payments for redemption/repurchase of preferred shares/units	-113,797	-177,955
Proceeds from unsecured debt	0	500,000
Payments on unsecured debt	-1,556	-426,462
Proceeds from secured debt financings	0	1,933
Payments on secured indebtedness including principal amortization	-93,036	-112,097
Borrowings (payments) on line of credit, net	52,000	-75,000
Distributions to common shareholders/unitholders	-169,917	-164,811
Distributions to preferred shareholders/unitholders	-20,789	-24,261
Distributions to Noncontrolling Interest, Net	-2,044	-2,692
Payments to Noncontrolling Interests	-7,803	0
Change in book overdrafts	-12,450	-44,225
Deferred financing costs	-499	-7,292
Net cash provided by (used for) financing activities	-113,929	99,669
Net increase (decrease) in cash and cash equivalents	46,857	-9,777
Cash and cash equivalents at beginning of period	19,275	33,889
Cash and cash equivalents at end of period	66,132	24,112
Noncash investing and financing activities:	'	'
Assumption of indebtedness and other liabilities in real estate acquisitions	54	106,555
Carrying amount of pre-existing ownership interest in acquired property	0	630
Conversion of Limited Partner Units to common shares	56	338
Duke Realty Limited Partnership [Member]	'	'
Cash flows from operating activities:	'	'
Net income (loss)	233,655	115,292
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'
Depreciation of buildings and tenant improvements	216,963	214,118
Amortization of deferred leasing and other costs	73,942	89,359
Amortization of deferred financing costs	7,423	9,913
Straight-line rental income and expense, net	-16,419	-12,421
Asset Impairment Charges	8,891	3,777
Gain on acquisitions	0	-962
Gains on land and depreciated property sales	-163,689	-105,525
Third-party construction contracts, net	-4,397	27,117
Other accrued revenues and expenses, net	18,059	11,405
Operating distributions received in excess of (less than) equity in earnings from unconsolidated companies	-53,429	-34,411
Net cash provided by operating activities	320,999	317,662
Cash flows from investing activities:	'	'
Development of real estate investments	-385,088	-320,698
Acquisition of real estate investments and related intangible assets	-94,032	-372,934
Acquisition of undeveloped land	-37,579	-30,101
Second generation tenant improvements, leasing costs and building improvements	-69,475	-60,052
Other deferred leasing costs	-24,948	-26,647
Other assets	514	-14,725
Proceeds from land and depreciated property sales, net	386,215	330,740
Capital distributions from unconsolidated companies	70,054	106,306
Capital contributions and advances to unconsolidated companies	-5,874	-38,959
Net cash provided by (used for) investing activities	-160,213	-427,070
Cash flows from financing activities:	'	'
Contributions from the General Partner	255,962	632,531
Payments for redemption/repurchase of preferred shares/units	-113,797	-177,955
Proceeds from unsecured debt	0	500,000
Payments on unsecured debt	-1,556	-426,462
Proceeds from secured debt financings	0	1,933
Payments on secured indebtedness including principal amortization	-93,036	-112,097
Borrowings (payments) on line of credit, net	52,000	-75,000
Distributions to common shareholders/unitholders	-172,153	-167,092
Distributions to preferred shareholders/unitholders	-20,789	-24,261
Distributions to Noncontrolling Interest, Net	192	-449
Payments to Noncontrolling Interests	-7,803	0
Change in book overdrafts	-12,450	-44,225
Deferred financing costs	-499	-7,292
Net cash provided by (used for) financing activities	-113,929	99,631
Net increase (decrease) in cash and cash equivalents	46,857	-9,777
Cash and cash equivalents at beginning of period	19,275	33,889
Cash and cash equivalents at end of period	66,132	24,112
Noncash investing and financing activities:	'	'
Assumption of indebtedness and other liabilities in real estate acquisitions	54	106,555
Carrying amount of pre-existing ownership interest in acquired property	0	630
Conversion of Limited Partner Units to common shares	$56	$338

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Equity (USD $)

Total

Preferred Stock [Member]

Common Stock [Member]

Additional Paid-in Capital [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Distributions in Excess of Net Income [Member]

Non-controlling Interest [Member]

Duke Realty Limited Partnership [Member]

Duke Realty Limited Partnership [Member]

Duke Realty Limited Partnership [Member]

Duke Realty Limited Partnership [Member]

Duke Realty Limited Partnership [Member]

Duke Realty Limited Partnership [Member]

Duke Realty Limited Partnership [Member]

In Thousands, unless otherwise specified

Preferred Stock [Member]

Common Stock [Member]

Limited Partner [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Non-controlling Interest [Member]

Stockholders' Equity, Total [Member]

Beginning Balance - Partnership at Dec. 31, 2013

'

'

'

'

'

'

'

$3,044,385

$447,683

$2,565,370

$20,158

$4,119

$7,055

$3,037,330

Beginning Balance - General Partner at Dec. 31, 2013

3,044,629

447,683

3,264

4,620,964

4,119

-2,062,787

31,386

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income

233,655

'

'

'

'

230,772

2,883

233,655

20,155

210,617

2,738

'

145

233,510

Other comprehensive income

-806

'

'

'

-806

'

'

-806

'

'

'

-806

'

-806

Issuance of common shares

255,962

'

146

255,816

'

'

'

'

'

'

'

'

'

'

Capital contribution from the General Partner

'

'

'

'

'

'

'

255,962

'

255,962

'

'

'

255,962

Stock based compensation plan activity

9,486

'

7

11,122

'

-1,643

'

9,486

'

9,486

'

'

'

9,486

Stock Issued During Period, Value, Conversion of Units

0

'

'

56

'

'

-56

0

'

56

-56

'

'

0

Distributions to preferred shareholders/unitholders

-20,155

'

'

'

'

-20,155

'

-20,155

-20,155

'

'

'

'

-20,155

Repurchase of preferred shares/units

-113,797

-114,889

'

3,805

'

-2,713

'

-113,797

-114,898

1,101

'

'

'

-113,797

Partners' Capital Account, Distributions

'

'

'

'

'

'

'

-172,153

'

-169,917

-2,236

'

'

-172,153

Distributions to common shareholders

-169,917

'

'

'

'

-169,917

'

'

'

'

'

'

'

'

Distributions to noncontrolling interests, net

-2,044

'

'

'

'

'

-2,044

192

'

'

'

'

192

'

Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests

-7,803

'

'

'

'

-2,637

-5,166

-7,803

'

-2,637

21

'

-5,187

-2,616

Ending Balance - Partnership at Sep. 30, 2014

'

'

'

'

'

'

'

3,228,966

332,785

2,870,038

20,625

3,313

2,205

3,226,761

Ending Balance - General Partner at Sep. 30, 2014

3,229,210

332,794

3,417

4,891,763

3,313

-2,029,080

27,003

'

'

'

'

'

'

'

Beginning Balance - Partnership at Jun. 30, 2014

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase (Decrease) in Stockholders' Equity [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income

71,557

'

'

'

'

'

'

71,557

'

'

'

'

'

'

Other comprehensive income

-287

'

'

'

'

'

'

-287

'

'

'

'

'

'

Ending Balance - Partnership at Sep. 30, 2014

'

'

'

'

'

'

'

3,228,966

'

'

'

'

'

'

Ending Balance - General Partner at Sep. 30, 2014

$3,229,210

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Statement_of_Chan1

Consolidated Statement of Changes in Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2014
Distributions to common shareholders, per share	$0.51
Duke Realty Limited Partnership [Member]	'
Distributions to Partners, per Common Unit	$0.51

General_Basis_of_Presentation_

General Basis of Presentation (Notes)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
General Basis of Presentation	'
	General Basis of Presentation
	The interim consolidated financial statements included herein have been prepared by Duke Realty Corporation (the "General Partner") and Duke Realty Limited Partnership (the "Partnership"). In this Report, unless the context indicates otherwise, the terms "Company," "we," "us" and "our" refer to the General Partner and the Partnership, collectively, and those entities owned or controlled by the General Partner and/or the Partnership. The 2013 year-end consolidated balance sheet data included in this Quarterly Report on Form 10-Q (this "Report") was derived from the audited financial statements in the combined Annual Report on Form 10-K of the General Partner and the Partnership for the year ended December 31, 2013, but does not include all disclosures required by accounting principles generally accepted in the United States of America ("GAAP"). The financial statements have been prepared in accordance with GAAP for interim financial information and in accordance with Rule 10-01 of Regulation S-X of the Securities Exchange Act of 1934, as amended. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and revenue and expenses during the reporting period. Our actual results could differ from those estimates and assumptions. These financial statements should be read in conjunction with Management's Discussion and Analysis of Financial Condition and Results of Operations included herein and the consolidated financial statements and notes thereto included in the combined Annual Report on Form 10-K of the General Partner and the Partnership for the year ended December 31, 2013.
	The General Partner was formed in 1985, and we believe that it qualifies as a real estate investment trust ("REIT") under the provisions of the Internal Revenue Code of 1986, as amended (the "Code"). The Partnership was formed on October 4, 1993, when the General Partner contributed all of its properties and related assets and liabilities, together with the net proceeds from an offering of additional shares of its common stock, to the Partnership. Simultaneously, the Partnership completed the acquisition of Duke Associates, a full-service commercial real estate firm operating in the Midwest whose operations began in 1972.
	The General Partner is the sole general partner of the Partnership, owning approximately 98.7% of the common partnership interests of the Partnership ("General Partner Units") at September 30, 2014. The remaining 1.3% of the common partnership interests ("Limited Partner Units" and, together with the General Partner Units, the "Common Units") are owned by limited partners. As the sole general partner of the Partnership, the General Partner has full, exclusive and complete responsibility and discretion in the day-to-day management and control of the Partnership. The General Partner and the Partnership are operated as one enterprise. The management of the General Partner consists of the same members as the management of the Partnership. As the sole general partner with control of the Partnership, the General Partner consolidates the Partnership for financial reporting purposes, and the General Partner does not have any significant assets other than its investment in the Partnership. Therefore, the assets and liabilities of the General Partner and the Partnership are substantially the same.
	Limited Partners have the right to redeem their Limited Partner Units, subject to certain restrictions. Pursuant to the Fifth Amended and Restated Agreement of Limited Partnership (the "Partnership Agreement"), as amended, the General Partner is obligated to redeem the Limited Partner Units in shares of its common stock, unless it determines in its reasonable discretion that the issuance of shares of its common stock could cause it to fail to qualify as a REIT. Each Limited Partner Unit shall be redeemed for one share of the General Partner's common stock, or, in the event that the issuance of shares could cause the General Partner to fail to qualify as a REIT, cash equal to the fair market value of one share of the General Partner's common stock at the time of redemption, in each case, subject to certain adjustments described in the Partnership Agreement. The Limited Partner Units are not required, per the terms of the Partnership Agreement, to be redeemed in registered shares of the General Partner. The General Partner also owns preferred partnership interests in the Partnership ("Preferred Units").
	We own and operate a portfolio primarily consisting of industrial, office and medical office properties and provide real estate services to third-party owners. Substantially all of our Rental Operations (see Note 10) are conducted through the Partnership. We conduct our Service Operations (see Note 10) through Duke Realty Services, LLC, Duke Realty Services Limited Partnership and Duke Construction Limited Partnership ("DCLP"), which are consolidated entities that are 100% owned by a combination of the General Partner and the Partnership. DCLP is owned through a taxable REIT subsidiary. The consolidated financial statements include our accounts and the accounts of our majority-owned or controlled subsidiaries.

New_Accounting_Pronouncement_N

New Accounting Pronouncement (Notes)	9 Months Ended
	Sep. 30, 2014
New Accounting Pronouncement [Abstract]	'
New Accounting Pronouncements, Policy [Policy Text Block]	'
	New Accounting Pronouncements
	Discontinued Operations
	In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"). Under ASU 2014-08, only disposals representing a strategic shift in operations (for example, a disposal of a major geographic area or a major line of business) will be presented as discontinued operations, while significant continuing involvement with such dispositions will no longer preclude discontinued operations classification. As current GAAP generally requires companies that sell a single investment property to report the sale as a discontinued operation, the implementation of ASU 2014-08 will result in us reporting only sales that represent strategic shifts in operations as discontinued operations. ASU 2014-08 will also require additional disclosures for discontinued operations as well as for material property dispositions that do not meet the new criteria for discontinued operation classification.
	ASU 2014-08 is effective for fiscal years beginning on or after December 15, 2014, with early adoption permitted only for disposals or classifications as held-for-sale that have not been reported in financial statements previously issued or available for issuance. We adopted ASU 2014-08 early and have applied it with respect to such items since April 1, 2014.
	Revenue Recognition
	In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"). ASU 2014-09 is a comprehensive revenue recognition standard that will supersede nearly all existing GAAP revenue recognition guidance as well as impact the existing GAAP guidance governing the sale of nonfinancial assets. The standard’s core principle is that a company will recognize revenue when it satisfies performance obligations, by transferring promised goods or services to customers, in an amount that reflects the consideration to which the company expects to be entitled in exchange for fulfilling those performance obligations. In doing so, companies will need to exercise more judgment and make more estimates than under existing GAAP guidance.
	ASU 2014-09 will be effective for public entities for annual and interim reporting periods beginning after December 15, 2016 and early adoption is not permitted. ASU 2014-09 allows for either recognizing the cumulative effect of application (i) at the start of the earliest comparative period presented (with the option to use any or all of three practical expedients) or (ii) at the date of initial application, with no restatement of comparative periods presented.
	We have not yet selected a transition method nor have we determined the effect of ASU 2014-09 on our ongoing financial reporting.

Reclassifications

Reclassifications	9 Months Ended
	Sep. 30, 2014
Reclassifications [Abstract]	'
Reclassifications	'
	Reclassifications
	Certain amounts in the accompanying consolidated financial statements for 2013 have been reclassified to conform to the 2014 consolidated financial statement presentation.

Variable_Interest_Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2014
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]	'
Consolidation Policy for VIEs	'
	Variable Interest Entities
	In June 2014, one of our unconsolidated joint ventures, which we had previously determined to be a variable interest entity ("VIE"), sold its sole property and repaid all of its third-party debt. The sale of this property caused the joint venture to no longer meet the criteria to be considered a VIE. As such, at September 30, 2014, there was one remaining unconsolidated joint venture that met the criteria to be considered a VIE. This unconsolidated joint venture was formed with the sole purpose of developing, constructing, leasing, marketing and selling or operating properties. The business activities of this unconsolidated joint venture have been financed through a combination of equity contributions, partner/member loans, and third-party debt that we have guaranteed. All significant decisions for this unconsolidated joint venture, including those decisions that most significantly impact its economic performance, require unanimous approval of the joint venture's partners or members. In certain cases, these decisions also require lender approval. Unanimous approval requirements for this unconsolidated joint venture include entering into new leases, setting annual operating budgets, selling underlying properties, and incurring additional indebtedness. Because no single entity exercises control over the decisions that most significantly affect this joint venture's economic performance, we determined there to be no individual primary beneficiary and that the equity method of accounting is appropriate.
	The following table provides a summary of the carrying value in our consolidated balance sheet, as well as our maximum loss exposure under the guarantee of debt, for the one unconsolidated subsidiary that we have determined to be a VIE at September 30, 2014 (in millions):
		Carrying Value			Maximum Loss Exposure
	Investment in unconsolidated companies	$	6		$	6
	Guarantee obligations (1)	$	(5.0	)	$	(99.4	)
	-1	We are party to a guarantee of the third-party debt of the joint venture that we have determined is a VIE, and our maximum loss exposure is equal to the outstanding borrowings on the joint venture's debt. The carrying value of our recorded guarantee obligation is included in other liabilities in our Consolidated Balance Sheets.
	Our maximum loss exposure for guarantees of joint venture indebtedness, including guarantees of the debt of joint ventures that are not VIEs, totaled $235.1 million at September 30, 2014.

Acquisitions_and_Dispositions

Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions and Dispositions	'
	Acquisitions and Dispositions
	2014 Acquisitions
	We acquired three industrial properties, a building in Atlanta, Georgia, a building in the Lehigh Valley region of Pennsylvania, and a building in Phoenix, Arizona during the nine months ended September 30, 2014. The following table summarizes the fair value of amounts recognized for each major class of asset and liability (in thousands) for these acquisitions:
	Real estate assets	$	86,988
	Lease related intangible assets	12,450
	Total acquired assets	99,438
	Other liabilities	54
	Total assumed liabilities	54
	Fair value of acquired net assets	$	99,384
	The leases in the acquired properties had an average remaining life at acquisition of approximately 8.7 years.
	We have included $3.2 million in rental revenues and $45,000 in earnings from continuing operations during 2014 for these properties since their respective dates of acquisition.
	Fair Value Measurements
	The fair value estimates used in allocating the aggregate purchase price of each acquisition among the individual components of real estate assets and liabilities were determined primarily through calculating the "as-if vacant" value of each building, using the income approach, and relied significantly upon internally determined assumptions. We have determined these estimates to have been primarily based upon Level 3 inputs, which are unobservable inputs based on our own assumptions. The range of most significant assumptions utilized in making the lease-up and future disposition estimates used in calculating the "as-if vacant" value of each building acquired during the nine months ended September 30, 2014 were as follows:
		Low		High
	Discount rate	7.38	%	9.96	%
	Exit capitalization rate	5.98	%	8.36	%
	Lease-up period (months)	12		12
	Net rental rate per square foot – Industrial	$2.75		$9.36
	Acquisition-Related Activity
	The acquisition-related activity in our Consolidated Statements of Operations and Comprehensive Income for the nine months ended September 30, 2014 and 2013 consisted of transaction costs related to completed acquisitions, which are expensed as incurred, as well as gains or losses related to acquisitions where we had a pre-existing non-controlling ownership interest. We expensed $871,000 and $3.5 million, respectively, for acquisition-related transaction costs incurred in the nine months ended September 30, 2014 and 2013. During the nine months ended September 30, 2013, we also recognized a gain of $962,000 on the pre-existing ownership interest that we held in an industrial property we acquired in that period.
	Dispositions
	We disposed of 23 consolidated income-producing real estate assets and 159 acres of undeveloped land during the nine months ended September 30, 2014. We received net cash proceeds from property and land dispositions of $386.2 million and $330.7 million during the nine months ended September 30, 2014 and 2013, respectively.
	Income tax expense from continuing operations of $2.6 million was the result of the sale of a property, prior to the adoption of ASU 2014-08, which was partially owned by our taxable REIT subsidiary. Due to continuing involvement in managing the property, it was not classified as a discontinued operation. Income tax expense included in discontinued operations of $3.0 million was also the result of the sale of a property, also prior to the adoption of ASU 2014-08, that was partially owned by our taxable REIT subsidiary where we have no continuing involvement.
	During the nine months ended September 30, 2014, five office properties and 11 industrial properties were sold by four of our unconsolidated joint ventures, for which our capital distributions totaled $70.1 million and our share of gains, which are included in equity in earnings, totaled $75.5 million. These five office properties included a 436,000 square foot office tower in Atlanta, Georgia and a three-building portfolio sale in central Florida totaling 415,000 square feet. The industrial disposition activity related to a sale from an unconsolidated joint venture, in which we did not hold a significant ownership interest, totaling 2.1 million square feet.

Indebtedness

Indebtedness	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Indebtedness	'
	Indebtedness
	All debt is held directly or indirectly by the Partnership. The General Partner does not have any indebtedness, but does guarantee some of the unsecured debt of the Partnership. The following table summarizes the book value and changes in the fair value of our debt for the nine months ended September 30, 2014 (in thousands):
		Book Value		Book Value				Fair Value		Issuances and		Payments/Payoffs			Adjustments		Fair Value
		at 12/31/13		at 9/30/14				at 12/31/13		Assumptions					to Fair Value		at 9/30/14
	Fixed rate secured debt	$	1,081,035	$	1,000,451			$	1,145,717	$	—	$	(77,347	)	$	22,044	$	1,090,414
	Variable rate secured debt	19,089		3,400				19,089		—		(15,689		)	—		3,400
	Unsecured debt	3,066,252		3,064,696				3,250,518		—		(1,556		)	57,476		3,306,438
	Unsecured line of credit	88,000		140,000				88,383		52,000		—			96		140,479
	Total	$	4,254,376	$	4,208,547			$	4,503,707	$	52,000	$	(94,592	)	$	79,616	$	4,540,731
	Secured Debt
	Because our fixed rate secured debt is not actively traded in any marketplace, we utilized a discounted cash flow methodology to determine its fair value. Accordingly, we calculated fair value by applying an estimate of the current market rate to discount the debt's remaining contractual cash flows. Our estimate of a current market rate, which is the most significant input in the discounted cash flow calculation, is intended to replicate debt of similar maturity and loan-to-value relationship. The estimated rates ranged from 2.20% to 4.40%, depending on the attributes of the specific loans. The current market rates we utilized were internally estimated; therefore, we have concluded that our determination of fair value for our fixed rate secured debt was primarily based upon Level 3 inputs.
	During the nine months ended September 30, 2014, we repaid seven secured loans, totaling $82.8 million. These loans had a weighted average stated interest rate of 5.55%.
	Unsecured Debt
	At September 30, 2014, with the exception of one variable rate term note, all of our unsecured debt bore interest at fixed rates and primarily consisted of unsecured notes that are publicly traded. We utilized broker estimates in estimating the fair value of our fixed rate unsecured debt. Our unsecured notes are thinly traded and, in certain cases, the broker estimates were not based upon comparable transactions. The broker estimates took into account any recent trades within the same series of our fixed rate unsecured debt, comparisons to recent trades of other series of our fixed rate unsecured debt, trades of fixed rate unsecured debt from companies with profiles similar to ours, as well as overall economic conditions. We reviewed these broker estimates for reasonableness and accuracy, considering whether the estimates were based upon market participant assumptions within the principal and most advantageous market and whether any other observable inputs would be more accurate indicators of fair value than the broker estimates. We concluded that the broker estimates were representative of fair value. We have determined that our estimation of the fair value of our fixed rate unsecured debt was primarily based upon Level 3 inputs. The estimated trading values of our fixed rate unsecured debt, depending on the maturity and coupon rates, ranged from 99.00% to 125.00% of face value.
	We utilize a discounted cash flow methodology in order to estimate the fair value of our $250.0 million variable rate term loan. The net present value of the difference between future contractual interest payments and future interest payments based on our estimate of a current market rate represents the difference between the book value and the fair value. Our estimate of a current market rate was based on estimated market spreads and the quoted yields on federal government treasury securities with similar maturity dates. Our estimate of the current market rate for our variable rate term loan was 1.31% and was based primarily upon Level 3 inputs.
	The indentures (and related supplemental indentures) governing our outstanding series of notes also require us to comply with financial ratios and other covenants regarding our operations. We were in compliance with all such covenants at September 30, 2014.
	Unsecured Line of Credit
	Our unsecured line of credit at September 30, 2014 is described as follows (in thousands):
	Description	Maximum		Maturity Date		Outstanding
		Capacity				Balance at
						September 30, 2014
	Unsecured Line of Credit - Partnership	$	850,000	Dec-15		$	140,000
	The Partnership's unsecured line of credit has an interest rate on borrowings of LIBOR plus 1.25% (equal to 1.41% for outstanding borrowings at September 30, 2014) and a maturity date of December 2015. Subject to certain conditions, the terms also include an option to increase the facility by up to an additional $400.0 million, for a total of up to $1.25 billion. This line of credit provides us with an option to obtain borrowings from financial institutions that participate in the line at rates that may be lower than the stated interest rate, subject to certain restrictions.
	This line of credit contains financial covenants that require us to meet certain financial ratios and defined levels of performance, including those related to fixed charge coverage, unsecured interest expense coverage and debt-to-asset value (with asset value being defined in the Partnership's unsecured line of credit agreement). At September 30, 2014, we were in compliance with all covenants under this line of credit.
	To the extent that there are outstanding borrowings, we utilize a discounted cash flow methodology in order to estimate the fair value of our unsecured line of credit. The net present value of the difference between future contractual interest payments and future interest payments based on our estimate of a current market rate represents the difference between the book value and the fair value. Our estimate of a current market rate is based upon the rate, considering current market conditions and our specific credit profile, at which we estimate we could obtain similar borrowings. The current market rate of 1.41% that we utilized was internally estimated; therefore, we have concluded that our determination of fair value for our unsecured line of credit was primarily based upon a Level 3 input.

Shareholders_Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2014
Stockholders' Equity Note [Abstract]	'
Shareholders' Equity	'
	Shareholders' Equity of the General Partner and Partners' Capital of the Partnership
	General Partner
	In the first nine months of 2014, pursuant to the share repurchase plan approved by our board of directors, the General Partner repurchased 750,243 preferred shares from among our three outstanding series. The preferred shares repurchased had a total redemption value of approximately $18.8 million and were repurchased for $17.7 million. In conjunction with the repurchases, approximately $618,000 of initial issuance costs, the ratable portion of such costs associated with the repurchased shares, were charged against income attributable to common shareholders. As the result of these repurchases, an adjustment of approximately $483,000 was included as an increase to net income attributable to common shareholders.
	In August 2014, the General Partner redeemed all 384,530 shares of its outstanding 6.625% Series J Cumulative Redeemable Preferred Shares ("Series J Shares"). The cash redemption price for the Series J Shares was $96.1 million, or $250.00 per share, plus dividends accrued through the date of redemption. Original offering costs of $3.2 million were included as a reduction to net income attributable to common shareholders in conjunction with the redemption of these shares.
	During the nine months ended September 30, 2014, the General Partner issued 14.6 million common shares pursuant to its at the market equity program, generating gross proceeds of approximately $258.6 million and, after deducting commissions and other costs, net proceeds of approximately $256.0 million. The proceeds from these offerings were used for general corporate purposes, which include the funding of development costs.
	In April 2014, the General Partner's shareholders approved an increase in the number of authorized shares of the General Partner's common stock from 400 million to 600 million.
	Partnership
	For each common share or preferred share that the General Partner issues, the Partnership issues a corresponding General Partner Unit or Preferred Unit, as applicable, to the General Partner in exchange for the contribution of the proceeds from the stock issuance. Similarly, when the General Partner redeems or repurchases common shares or preferred shares, the Partnership redeems the corresponding Common Units or Preferred Units held by the General Partner at the same price.

Related_Party_Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	We provide property management, asset management, leasing, construction and other tenant-related services to unconsolidated companies in which we have equity interests. We recorded the corresponding fees based on contractual terms that approximate market rates for these types of services and have eliminated our ownership percentage of these fees in the consolidated financial statements. The following table summarizes the fees earned from these companies, prior to the elimination of our ownership percentage, for the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Management fees	$	2,233	$	2,246	$	6,569	$	6,872
	Leasing fees	572		310		3,085		1,432
	Construction and development fees	1,529		681		4,911		3,258

Net_Income_Loss_Per_Common_Sha

Net Income (Loss) Per Common Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Common Share	'
	Net Income (Loss) Per Common Share or Common Unit
	Basic net income (loss) per common share or Common Unit is computed by dividing net income (loss) attributable to common shareholders or common unitholders, less dividends or distributions on share-based awards expected to vest (referred to as "participating securities" and primarily composed of unvested restricted stock units), by the weighted average number of common shares or Common Units outstanding for the period.
	Diluted net income (loss) per common share is computed by dividing the sum of basic net income (loss) attributable to common shareholders and the noncontrolling interest in earnings allocable to Limited Partner Units (to the extent the Limited Partner Units are dilutive) by the sum of the weighted average number of common shares outstanding and, to the extent they are dilutive, Units outstanding and any potential dilutive securities for the period. Diluted net income (loss) per Common Unit is computed by dividing the basic net income (loss) attributable to common unitholders by the sum of the weighted average number of Common Units outstanding and any potential dilutive securities for the period. The following table reconciles the components of basic and diluted net income per common share or Common Unit for the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2014				2013			2014			2013
	General Partner
	Net income (loss) attributable to common shareholders	$	61,533			$	(6,067	)	$	207,904		$	83,470
	Less: Dividends on participating securities	(651		)		(650		)	(1,941		)	(2,024		)
	Basic net income (loss) attributable to common shareholders	60,882				(6,717		)	205,963			81,446
	Noncontrolling interest in earnings of common unitholders	795				—			2,738			1,142
	Diluted net income (loss) attributable to common shareholders	$	61,677			$	(6,717	)	$	208,701		$	82,588
	Weighted average number of common shares outstanding	341,165				324,895			333,393			320,810
	Weighted average Limited Partner Units outstanding	4,380				—			4,384			4,393
	Other potential dilutive shares	281				—			280			177
	Weighted average number of common shares and potential dilutive securities	345,826				324,895			338,057			325,380
	Partnership
	Net income (loss) attributable to common unitholders	$	62,328			$	(6,159	)	$	210,642		$	84,612
	Less: Distributions on participating securities	(651		)		(650		)	(1,941		)	(2,024		)
	Basic and diluted net income (loss) attributable to common unitholders	$	61,677			$	(6,809	)	$	208,701		$	82,588
	Weighted average number of Common Units outstanding	345,545				329,283			337,777			325,203
	Other potential dilutive units	281				—			280			177
	Weighted average number of Common Units and potential dilutive securities	345,826				329,283			338,057			325,380
	Substantially all potential shares related to our stock-based compensation plans are anti-dilutive for all periods presented. The following table summarizes the data that is excluded from the computation of net income per common share or Common Unit as a result of being anti-dilutive (in thousands):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014		2013
	General Partner and Partnership
	Potential dilutive shares or units:
	Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans	1,215			1,373			1,215		1,373
	Outstanding participating securities	3,867			3,866			3,867		3,866

Segment_Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting	'
	Segment Reporting
	Reportable Segments
	We have four reportable operating segments at September 30, 2014, the first three of which consist of the ownership and rental of (i) industrial, (ii) office and (iii) medical office real estate investments. The operations of our industrial, office and medical office properties, along with our retail properties, are collectively referred to as "Rental Operations." Our retail properties, as well as any other properties not included in our reportable segments, do not by themselves meet the quantitative thresholds for separate presentation as a reportable segment and are referred to as non-reportable Rental Operations. The fourth reportable segment consists of various real estate services such as property management, asset management, maintenance, leasing, development, general contracting and construction management to third-party property owners and joint ventures, and is collectively referred to as "Service Operations." Our reportable segments offer different products or services and are managed separately because each segment requires different operating strategies and management expertise.
	Revenues by Reportable Segment
	The following table shows the revenues for each of the reportable segments, as well as a reconciliation to consolidated revenues, for the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
			Three Months Ended September 30,							Nine Months Ended September 30,
			2014				2013			2014			2013
	Revenues
	Rental Operations:
	Industrial		$	131,212			$	122,643		$	394,209		$	354,468
	Office		60,672				63,120			194,236			187,973
	Medical Office		36,715				32,542			104,979			94,571
	Non-reportable Rental Operations		1,698				1,765			5,414			5,807
	Service Operations		59,739				62,807			185,072			161,004
	Total segment revenues		290,036				282,877			883,910			803,823
	Other revenue		1,025				1,585			3,352			4,023
	Consolidated revenue from continuing operations		291,061				284,462			887,262			807,846
	Discontinued operations		454				11,140			2,415			39,807
	Consolidated revenue		$	291,515			$	295,602		$	889,677		$	847,653
	Supplemental Performance Measure
	Prior to 2014, we evaluated the profitability of our reportable segments using net earnings excluding depreciation and other items that were not allocated to our operating segments. As the result of a shift in the focus of our executive management team on the metrics used to evaluate the performance of, and to allocate resources among, our reportable segments, we elected to change our segment measurement of profitability beginning with the period ended March 31, 2014. We have also revised prior period information in order to provide period-over-period comparability.
	Property level net operating income, on a cash basis ("PNOI") is the non-GAAP supplemental performance measure that we now use to evaluate the performance of, and to allocate resources among, the real estate investments in the reportable and operating segments that comprise our Rental Operations. PNOI for our Rental Operations segments is comprised of rental revenues from continuing operations less rental expenses and real estate taxes from continuing operations, along with certain other adjusting items (collectively referred to as "Rental Operations revenues and expenses excluded from PNOI," as shown in the table below). Additionally, we do not allocate interest expense, depreciation expense and certain other non-property specific revenues and expenses (collectively referred to as "Non-Segment Items," as shown in the table below) to our individual operating segments.
	We evaluate the performance of our Service Operations reportable segment using net income or loss, as allocated to that segment ("Earnings from Service Operations").
	The following table shows a reconciliation of our segment-level measures of profitability to consolidated income from continuing operations before income taxes for the three and nine months ended September 30, 2014 and 2013, respectively (in thousands and excluding discontinued operations):
			Three Months Ended September 30,							Nine Months Ended September 30,
			2014				2013			2014			2013
	PNOI
	Industrial		$	97,324			$	88,968		$	284,191		$	254,849
	Office		34,894				30,982			100,237			94,959
	Medical Office		23,228				18,239			65,592			51,764
	Non-reportable Rental Operations		929				1,087			3,234			3,138
	Total PNOI		156,375				139,276			453,254			404,710
	Earnings from Service Operations		7,211				3,415			21,415			18,079
	Rental Operations revenues and expenses excluded from PNOI:
	Straight-line rental income and expense, net		5,527				2,942			16,929			11,040
	Revenues related to lease buyouts		145				2,936			4,365			9,615
	Amortization of lease concessions and above and below market rents		(1,220		)		(2,267		)	(5,376		)	(6,485		)
	Intercompany rents and other adjusting items		(1,221		)		(1,125		)	(3,323		)	(3,470		)
	PNOI from sold/held-for-sale properties included in continuing operations		807				9,332			11,568			25,449
	Non-Segment Items:
	Equity in earnings (loss) of unconsolidated companies		19,178				(27		)	82,325			50,442
	Interest expense		(53,343		)		(56,618		)	(163,479		)	(171,365		)
	Depreciation expense		(95,000		)		(101,191		)	(290,700		)	(289,508		)
	Gain on sale of properties		47,143				—			133,617			1,108
	Impairment charges on non-depreciable properties		(6,368		)		—			(8,891		)	(3,777		)
	Interest and other income, net		356				145			936			1,219
	Other operating expenses		(56		)		(47		)	(277		)	(150		)
	General and administrative expenses		(10,573		)		(10,373		)	(35,632		)	(33,225		)
	Gain on land sales		3,167				3,365			7,208			3,365
	Undeveloped land carrying costs		(1,773		)		(2,108		)	(5,755		)	(6,837		)
	Loss on extinguishment of debt		—				—			(139		)	—
	Acquisition-related activity		(110		)		(726		)	(871		)	(2,506		)
	Other non-segment revenues and expenses, net		(269		)		(31		)	(1,041		)	491
	Income (loss) from continuing operations before income taxes		$	69,976			$	(13,102	)	$	216,133		$	8,195
	The most comparable GAAP measure to PNOI is income from continuing operations before income taxes. PNOI excludes expenses that materially impact our overall results of operations and, therefore, should not be considered as a substitute for income from continuing operations before income taxes or any other measures derived in accordance with GAAP. Furthermore, PNOI may not be comparable to other similarly titled measures of other companies.
	Assets by Reportable Segment
	The assets for each of the reportable segments at September 30, 2014 and December 31, 2013 were as follows (in thousands):
		September 30,				December 31,
		2014				2013
	Assets
	Rental Operations:
	Industrial	$	4,673,507			$	4,414,740
	Office	1,378,083				1,524,501
Medical Office	1,172,615				1,170,420
Non-reportable Rental Operations	76,736				81,056
Service Operations	157,815				145,222
Total segment assets	7,458,756				7,335,939
Non-segment assets	425,439				416,675
Consolidated assets	$	7,884,195			$	7,752,614

Discontinued_Operations_Assets

Discontinued Operations, Assets Held for Sale and Impairments	9 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Discontinued Operations and Assets Held for Sale	'
	Discontinued Operations, Assets Held-for-Sale and Impairments
	The following table illustrates the number of sold or held-for-sale properties included in, or excluded from, discontinued operations:
		Held-for-Sale at September 30, 2014		Sold in 2014	Sold in 2013		Total
	Industrial	0		11	6		17
	Office	0		0	12		12
	Medical Office	1		1	6		8
	Retail	0		0	1		1
	Total properties included in discontinued operations	1		12	25		38
	Properties excluded from discontinued operations	2		11	13		26
	Total properties sold or classified as held-for-sale	3		23	38		64
	As described in Note 2, we adopted ASU 2014-08 beginning April 1, 2014. Three properties were designated as held-for-sale at March 31, 2014, and met the criteria for discontinued operations that were applicable prior to the adoption of ASU 2014-08. Two of these properties were sold during the three months ended June 30, 2014, while one of these properties continues to be designated as held-for-sale at September 30, 2014. No new properties, whether having been disposed of or designated as held-for-sale, have met the criteria for classification as discontinued operations since the adoption of ASU 2014-08.
	For the properties that were classified in discontinued operations prior to the adoption of ASU 2014-08, we allocated interest expense to discontinued operations and have included such interest expense in computing income from discontinued operations. Interest expense allocable to discontinued operations includes interest on any secured debt for properties included in discontinued operations and an allocable share of our consolidated unsecured interest expense for unencumbered properties. The allocation of unsecured interest expense to discontinued operations was based upon the gross book value of the unencumbered real estate assets included in discontinued operations as it related to the total gross book value of our unencumbered real estate assets.
	The following table illustrates the operational results of the buildings reflected in discontinued operations for the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Revenues	$	454		$	11,140		$	2,415		$	39,807
	Operating expenses	(297		)	(4,144		)	(1,282		)	(14,983		)
	Depreciation and amortization	—			(3,247		)	(205		)	(13,969		)
	Operating income	157			3,749			928			10,855
	Interest expense	(137		)	(2,251		)	(706		)	(9,310		)
	Income before gain on sales	20			1,498			222			1,545
	Gain on sale of depreciable properties	564			8,441			22,864			101,052
	Income from discontinued operations before income taxes	584			9,939			23,086			102,597
	Income tax benefit (expense)	555			—			(2,969		)	—
	Income from discontinued operations	$	1,139		$	9,939		$	20,117		$	102,597
	The income tax expense or benefit included in discontinued operations during the three and nine months ended September 30, 2014 was triggered by the sale of a property that was partially owned by our taxable REIT subsidiary.
	The income tax benefit of $442,000 and income tax expense of $2.6 million from continuing operations for the three and nine months ended September 30, 2014, respectively, as presented in the Consolidated Statements of Operations and Comprehensive Income, was related to the sale of another property that was partially owned by our taxable REIT subsidiary but, due to continuing involvement in managing the property, was not classified as a discontinued operation.
	Dividends or distributions on preferred shares or Preferred Units and adjustments for the redemption or repurchase of preferred shares or Preferred Units are allocated entirely to continuing operations for both the General Partner and the Partnership.
	Allocation of Noncontrolling Interests - General Partner
	The following table illustrates the General Partner's share of the income (loss) attributable to common shareholders from continuing operations and discontinued operations, reduced by the allocation of income or loss between continuing and discontinued operations to the Limited Partner Units, for the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Income (loss) from continuing operations attributable to common shareholders	$	60,408		$	(15,874	)	$	188,048		$	(17,741	)
	Income from discontinued operations attributable to common shareholders	1,125			9,807			19,856			101,211
	Net income (loss) attributable to common shareholders	$	61,533		$	(6,067	)	$	207,904		$	83,470
	Allocation of Noncontrolling Interests - Partnership
	Substantially all of the income from discontinued operations for all periods presented in the Partnership's Consolidated Statements of Operations and Comprehensive Income is attributable to the common unitholders.
	Properties Held-for-Sale
	At September 30, 2014, one in-service property, which was classified in discontinued operations prior to the adoption of ASU 2014-08, met the criteria for designation as held-for-sale. Additionally, two in-service properties met the criteria for designation as held-for-sale subsequent to the adoption of ASU 2014-08, but did not meet the criteria to be classified within discontinued operations. The following table illustrates aggregate balance sheet information of these properties at September 30, 2014 (in thousands):
		30-Sep-14
		Properties Included in Continuing Operations			Properties Included in Discontinued Operations			Total Held-For-Sale Properties
	Real estate investment, net	$	14,940		$	14,643		$	29,583
	Other assets	473			5,358			5,831
	Total assets held-for-sale	$	15,413		$	20,001		$	35,414
	Accrued expenses	$	356		$	262		$	618
	Other liabilities	87			—			87
	Total liabilities held-for-sale	$	443		$	262		$	705
	Impairment Charges
	The following table illustrates impairment charges recognized during the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Impairment charges - land	$	5,915		$	—		$	8,438		$	3,777
	Impairment charges - building	453			—			453			—
	Impairment charges	$	6,368		$	—		$	8,891		$	3,777
	During 2014, we refined our strategy for selected parcels of land, whereby we decided that we would dispose of such parcels in the near future as opposed to holding them for development. The change in strategy for this land triggered the requirement to conduct an impairment analysis, which resulted in a determination that these parcels were impaired. We recognized impairment charges of $8.4 million in the nine months ended September 30, 2014, primarily as the result of writing down this land to its fair value. As part of determining the fair value of the non-strategic land in connection with the impairment analysis, we considered comparable transactions and, in certain cases, estimates made by national and local independent real estate brokers who were familiar both with the land parcels subject to evaluation as well as with conditions in the specific markets where the land is located. In all cases, members of our senior management who were responsible for the individual markets where the land is located and members of the Company’s accounting and financial management team reviewed the broker’s estimates for factual accuracy and reasonableness. In all cases, we were ultimately responsible for all valuation estimates made in determining the extent of the impairment. Our valuation estimates primarily relied upon Level 3 inputs, as defined in our Annual Report on Form 10-K for the year ended December 31, 2013.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	Declaration of Dividends/Distributions
	The General Partner's board of directors declared the following dividends/distributions at its regularly scheduled board meeting held on October 29, 2014:
	Class of stock/units	Quarterly Amount per Share or Unit	Record Date	Payment Date
	Common	$0.17	November 14, 2014	November 28, 2014
	Preferred (per depositary share or unit):
	Series K	$0.41	November 14, 2014	November 28, 2014
	Series L	$0.41	November 14, 2014	November 28, 2014
	Amended and Restated Unsecured Line of Credit Agreement
	In October 2014, we extended the Partnership's line of credit through January 2019 (with two six-month extension options) while increasing its borrowing capacity from $850.0 million to $1.2 billion, with the accordion feature remaining at $400.0 million for an aggregate total possible commitment of up to $1.6 billion, and reducing the interest rate on outstanding borrowings from LIBOR plus 1.25% to LIBOR plus 1.05%. Additionally, the amendment extended the term of the Partnership's existing variable rate term loan until January 2019 (with a one-year extension option), and such variable rate term loan now bears interest at a rate equal to LIBOR plus 1.15% based on the Partnership's current credit ratings.

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2014
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]	'
Balances Related to Joint Ventures	'
		Carrying Value			Maximum Loss Exposure
	Investment in unconsolidated companies	$	6		$	6
	Guarantee obligations (1)	$	(5.0	)	$	(99.4	)
	-1	We are party to a guarantee of the third-party debt of the joint venture that we have determined is a VIE, and our maximum loss exposure is equal to the outstanding borrowings on the joint venture's debt. The carrying value of our recorded guarantee obligation is included in other liabilities in our Consolidated Balance Sheets.

Acquisitions_and_Dispositions_

Acquisitions and Dispositions (Tables)	9 Months Ended
	Sep. 30, 2014
Summary of Most Significant Assumptions Utilized in the Estimations [Table Text Block]	'
		Low		High
	Discount rate	7.38	%	9.96	%
	Exit capitalization rate	5.98	%	8.36	%
	Lease-up period (months)	12		12
	Net rental rate per square foot – Industrial	$2.75		$9.36
Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member] [Member]	'
Summary of Allocation of Fair Value of Amounts Recognized	'
	Real estate assets	$	86,988
	Lease related intangible assets	12,450
	Total acquired assets	99,438
	Other liabilities	54
	Total assumed liabilities	54
	Fair value of acquired net assets	$	99,384

Indebtedness_Tables

Indebtedness (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Fair Value, Liabilities Measured on a Recurring Basis, Disclosure Only	'
		Book Value		Book Value				Fair Value		Issuances and		Payments/Payoffs			Adjustments		Fair Value
		at 12/31/13		at 9/30/14				at 12/31/13		Assumptions					to Fair Value		at 9/30/14
	Fixed rate secured debt	$	1,081,035	$	1,000,451			$	1,145,717	$	—	$	(77,347	)	$	22,044	$	1,090,414
	Variable rate secured debt	19,089		3,400				19,089		—		(15,689		)	—		3,400
	Unsecured debt	3,066,252		3,064,696				3,250,518		—		(1,556		)	57,476		3,306,438
	Unsecured line of credit	88,000		140,000				88,383		52,000		—			96		140,479
	Total	$	4,254,376	$	4,208,547			$	4,503,707	$	52,000	$	(94,592	)	$	79,616	$	4,540,731
Unsecured Line of Credit	'
	Description	Maximum		Maturity Date		Outstanding
		Capacity				Balance at
						September 30, 2014
	Unsecured Line of Credit - Partnership	$	850,000	Dec-15		$	140,000

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Schedule of Fees Earned from Related Parties	'
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Management fees	$	2,233	$	2,246	$	6,569	$	6,872
	Leasing fees	572		310		3,085		1,432
	Construction and development fees	1,529		681		4,911		3,258

Net_Income_Loss_Per_Common_Sha1

Net Income (Loss) Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share	'
		Three Months Ended September 30,							Nine Months Ended September 30,
		2014				2013			2014			2013
	General Partner
	Net income (loss) attributable to common shareholders	$	61,533			$	(6,067	)	$	207,904		$	83,470
	Less: Dividends on participating securities	(651		)		(650		)	(1,941		)	(2,024		)
	Basic net income (loss) attributable to common shareholders	60,882				(6,717		)	205,963			81,446
	Noncontrolling interest in earnings of common unitholders	795				—			2,738			1,142
	Diluted net income (loss) attributable to common shareholders	$	61,677			$	(6,717	)	$	208,701		$	82,588
	Weighted average number of common shares outstanding	341,165				324,895			333,393			320,810
	Weighted average Limited Partner Units outstanding	4,380				—			4,384			4,393
	Other potential dilutive shares	281				—			280			177
	Weighted average number of common shares and potential dilutive securities	345,826				324,895			338,057			325,380
	Partnership
	Net income (loss) attributable to common unitholders	$	62,328			$	(6,159	)	$	210,642		$	84,612
	Less: Distributions on participating securities	(651		)		(650		)	(1,941		)	(2,024		)
	Basic and diluted net income (loss) attributable to common unitholders	$	61,677			$	(6,809	)	$	208,701		$	82,588
	Weighted average number of Common Units outstanding	345,545				329,283			337,777			325,203
	Other potential dilutive units	281				—			280			177
	Weighted average number of Common Units and potential dilutive securities	345,826				329,283			338,057			325,380
Computation of Anti-Dilutive Common Share	'
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014		2013
	General Partner and Partnership
	Potential dilutive shares or units:
	Anti-dilutive outstanding potential shares or units under fixed stock option and other stock-based compensation plans	1,215			1,373			1,215		1,373
	Outstanding participating securities	3,867			3,866			3,867		3,866

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Reconciliation of Revenue from Segments to Consolidated	'
			Three Months Ended September 30,							Nine Months Ended September 30,
			2014				2013			2014			2013
	Revenues
	Rental Operations:
	Industrial		$	131,212			$	122,643		$	394,209		$	354,468
	Office		60,672				63,120			194,236			187,973
	Medical Office		36,715				32,542			104,979			94,571
	Non-reportable Rental Operations		1,698				1,765			5,414			5,807
	Service Operations		59,739				62,807			185,072			161,004
	Total segment revenues		290,036				282,877			883,910			803,823
	Other revenue		1,025				1,585			3,352			4,023
	Consolidated revenue from continuing operations		291,061				284,462			887,262			807,846
	Discontinued operations		454				11,140			2,415			39,807
	Consolidated revenue		$	291,515			$	295,602		$	889,677		$	847,653
Summary of Net Operation Income	'
			Three Months Ended September 30,							Nine Months Ended September 30,
			2014				2013			2014			2013
	PNOI
	Industrial		$	97,324			$	88,968		$	284,191		$	254,849
	Office		34,894				30,982			100,237			94,959
	Medical Office		23,228				18,239			65,592			51,764
	Non-reportable Rental Operations		929				1,087			3,234			3,138
	Total PNOI		156,375				139,276			453,254			404,710
	Earnings from Service Operations		7,211				3,415			21,415			18,079
	Rental Operations revenues and expenses excluded from PNOI:
	Straight-line rental income and expense, net		5,527				2,942			16,929			11,040
	Revenues related to lease buyouts		145				2,936			4,365			9,615
	Amortization of lease concessions and above and below market rents		(1,220		)		(2,267		)	(5,376		)	(6,485		)
	Intercompany rents and other adjusting items		(1,221		)		(1,125		)	(3,323		)	(3,470		)
	PNOI from sold/held-for-sale properties included in continuing operations		807				9,332			11,568			25,449
	Non-Segment Items:
	Equity in earnings (loss) of unconsolidated companies		19,178				(27		)	82,325			50,442
	Interest expense		(53,343		)		(56,618		)	(163,479		)	(171,365		)
	Depreciation expense		(95,000		)		(101,191		)	(290,700		)	(289,508		)
	Gain on sale of properties		47,143				—			133,617			1,108
	Impairment charges on non-depreciable properties		(6,368		)		—			(8,891		)	(3,777		)
	Interest and other income, net		356				145			936			1,219
	Other operating expenses		(56		)		(47		)	(277		)	(150		)
	General and administrative expenses		(10,573		)		(10,373		)	(35,632		)	(33,225		)
	Gain on land sales		3,167				3,365			7,208			3,365
	Undeveloped land carrying costs		(1,773		)		(2,108		)	(5,755		)	(6,837		)
	Loss on extinguishment of debt		—				—			(139		)	—
	Acquisition-related activity		(110		)		(726		)	(871		)	(2,506		)
	Other non-segment revenues and expenses, net		(269		)		(31		)	(1,041		)	491
	Income (loss) from continuing operations before income taxes		$	69,976			$	(13,102	)	$	216,133		$	8,195
Reportable Segments Consolidated Assets	'
		September 30,				December 31,
		2014				2013
	Assets
	Rental Operations:
	Industrial	$	4,673,507			$	4,414,740
	Office	1,378,083				1,524,501
	Medical Office	1,172,615				1,170,420
	Non-reportable Rental Operations	76,736				81,056
	Service Operations	157,815				145,222
	Total segment assets	7,458,756				7,335,939
	Non-segment assets	425,439				416,675
	Consolidated assets	$	7,884,195			$	7,752,614

Discontinued_Operations_Assets1

Discontinued Operations, Assets Held for Sale and Impairments (Tables)	9 Months Ended
	Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]	'
Table Illustration of Number of Properties in Discontinued Operations	'
		Held-for-Sale at September 30, 2014		Sold in 2014	Sold in 2013		Total
	Industrial	0		11	6		17
	Office	0		0	12		12
	Medical Office	1		1	6		8
	Retail	0		0	1		1
	Total properties included in discontinued operations	1		12	25		38
	Properties excluded from discontinued operations	2		11	13		26
	Total properties sold or classified as held-for-sale	3		23	38		64
Table Illustration of Discontinued Operations in Statement of Operations	'
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Revenues	$	454		$	11,140		$	2,415		$	39,807
	Operating expenses	(297		)	(4,144		)	(1,282		)	(14,983		)
	Depreciation and amortization	—			(3,247		)	(205		)	(13,969		)
	Operating income	157			3,749			928			10,855
	Interest expense	(137		)	(2,251		)	(706		)	(9,310		)
	Income before gain on sales	20			1,498			222			1,545
	Gain on sale of depreciable properties	564			8,441			22,864			101,052
	Income from discontinued operations before income taxes	584			9,939			23,086			102,597
	Income tax benefit (expense)	555			—			(2,969		)	—
	Income from discontinued operations	$	1,139		$	9,939		$	20,117		$	102,597
Allocation of Common Shareholders' Income (Loss) Between Continuing and Discontinued Operations	'
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Income (loss) from continuing operations attributable to common shareholders	$	60,408		$	(15,874	)	$	188,048		$	(17,741	)
	Income from discontinued operations attributable to common shareholders	1,125			9,807			19,856			101,211
	Net income (loss) attributable to common shareholders	$	61,533		$	(6,067	)	$	207,904		$	83,470
Schedule of Discontinued Operations, Properties Held-for-Sale, Aggregate Balance Sheet Information [Table Text Block]	'
	The following table illustrates aggregate balance sheet information of these properties at September 30, 2014 (in thousands):
		30-Sep-14
		Properties Included in Continuing Operations			Properties Included in Discontinued Operations			Total Held-For-Sale Properties
	Real estate investment, net	$	14,940		$	14,643		$	29,583
	Other assets	473			5,358			5,831
	Total assets held-for-sale	$	15,413		$	20,001		$	35,414
	Accrued expenses	$	356		$	262		$	618
	Other liabilities	87			—			87
	Total liabilities held-for-sale	$	443		$	262		$	705
Asset Impairment Charges [Text Block]	'
	The following table illustrates impairment charges recognized during the three and nine months ended September 30, 2014 and 2013, respectively (in thousands):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Impairment charges - land	$	5,915		$	—		$	8,438		$	3,777
	Impairment charges - building	453			—			453			—
	Impairment charges	$	6,368		$	—		$	8,891		$	3,777

Subsequent_Events_Tables

Subsequent Events (Tables)	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Schedule of Dividends Declared	'
	Class of stock/units	Quarterly Amount per Share or Unit	Record Date	Payment Date
	Common	$0.17	November 14, 2014	November 28, 2014
	Preferred (per depositary share or unit):
	Series K	$0.41	November 14, 2014	November 28, 2014
	Series L	$0.41	November 14, 2014	November 28, 2014

General_Basis_of_Presentation_1

General Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	98.70%
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	1.30%

Variable_Interest_Entities_Bal

Variable Interest Entities (Balances Related to Joint Ventures) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
	entities
Variable Interest Entity, Not Primary Beneficiary, Disclosures [Abstract]	'
Number of Unconsolidated Joint Ventures Considered Variable Interest Entities	1
Carrying Value of Investment in Unconsolidated Companies	$6
Maximum Loss Exposure From Investment In Unconsolidated VIEs	6
Carrying Value of Guarantee Obligations	-5
Maximum Loss Exposure from Guarantee Obligations	-99.4
Guarantor Obligations, Maximum Exposure, Undiscounted	$235.10

Acquisitions_and_Dispositions_1

Acquisitions and Dispositions (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
	entities		buildings		buildings
			entities
Operating Leases, Income Statement, Lease Revenue	$231,322,000	$221,655,000	$702,190,000	$646,842,000	'
Operating Income (Loss)	123,073,000	44,097,000	379,686,000	180,847,000	'
Business Combination, Acquisition Related Costs	'	'	871,000	3,500,000	'
Gain Loss On Business Combinations Excluding Acquisitions Costs	'	'	'	-962,000	'
Number of Real Estate Properties Sold	'	'	23	'	38
Proceeds from land and depreciated property sales, net	'	'	386,215,000	330,740,000	'
Income Tax Expense (Benefit)	-442,000	-4,500,000	2,595,000	-4,500,000	'
Discontinued Operation, Tax Effect of Discontinued Operation	-555,000	0	2,969,000	0	'
Number of Unconsolidated Joint Ventures in which Equity Interests Held	4	'	4	'	'
Capital distributions from unconsolidated companies	'	'	70,054,000	106,306,000	'
Earnings from Depreciated Property Sales Share of Joint Venture	'	'	75,500,000	'	'
Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member] [Member]	'	'	'	'	'
Weighted average remaining life of property (years)	'	'	'8 years 8 months 13 days	'	'
Operating Leases, Income Statement, Lease Revenue	'	'	3,200,000	'	'
Operating Income (Loss)	'	'	$45,000	'	'
Industrial [Member] | Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member] [Member]	'	'	'	'	'
Number of real estate properties acquired	3	'	3	'	'
Acres Sold [Member]	'	'	'	'	'
Area of Land	159	'	159	'	'
Office [Member] | Unconsolidated Properties [Member]	'	'	'	'	'
Number of Real Estate Properties Sold	'	'	5	'	'
Industrial [Member] | Unconsolidated Properties [Member]	'	'	'	'	'
Number of Real Estate Properties Sold	'	'	11	'	'
Square Footage Of Real Estate Properties Acquired Or Disposed	'	'	2,072,000	'	'
Atlanta Georgia [Member] | Office [Member] | Unconsolidated Properties [Member]	'	'	'	'	'
Square Footage Of Real Estate Properties Acquired Or Disposed	'	'	436,000	'	'
Central Florida [Member] | Office [Member] | Unconsolidated Properties [Member]	'	'	'	'	'
Square Footage Of Real Estate Properties Acquired Or Disposed	'	'	415,000	'	'

Acquisitions_and_Dispositions_2

Acquisitions and Dispositions (Summary of Allocation of Fair Value of Amounts Recognized) (Details) (Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member], USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member]	'
Real estate assets	$86,988
Lease related intangible assets	12,450
Total acquired assets	99,438
Other liabilities	54
Total assumed liabilities	54
Fair value of acquired assets	$99,384

Acquisitions_and_Dispositions_3

Acquisitions and Dispositions (Summary of Significant Assumptions Utilized in Estimates) (Details)	9 Months Ended
	Sep. 30, 2014
	months
Minimum [Member]	'
Business Acquisition [Line Items]	'
Fair Value Inputs, Discount Rate	7.38%
Fair Value Inputs, Cap Rate	5.98%
Fair Value Measurement With Unobservable Inputs Lease up Period in Months	12
Minimum [Member] | Industrial [Member]	'
Business Acquisition [Line Items]	'
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	2.75
Maximum [Member]	'
Business Acquisition [Line Items]	'
Fair Value Inputs, Discount Rate	9.96%
Fair Value Inputs, Cap Rate	8.36%
Fair Value Measurement With Unobservable Inputs Lease up Period in Months	12
Maximum [Member] | Industrial [Member]	'
Business Acquisition [Line Items]	'
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	9.36

Indebtedness_Summary_of_Book_V

Indebtedness (Summary of Book Value and Changes in Fair Value of Debt) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Book value	$4,208,547	$4,254,376
Fair value	4,540,731	4,503,707
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	52,000	'
Payments/Payoffs	-94,592	'
Adjustments to fair value	79,616	'
Fixed Rate Secured Debt [Member]	'	'
Book value	1,000,451	1,081,035
Fair value	1,090,414	1,145,717
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0	'
Payments/Payoffs	-77,347	'
Adjustments to fair value	22,044	'
Variable Rate Secured Debt [Member]	'	'
Book value	3,400	19,089
Fair value	3,400	19,089
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0	'
Payments/Payoffs	-15,689	'
Adjustments to fair value	0	'
Unsecured Debt [Member]	'	'
Book value	3,064,696	3,066,252
Fair value	3,306,438	3,250,518
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	0	'
Payments/Payoffs	-1,556	'
Adjustments to fair value	57,476	'
Line of Credit [Member]	'	'
Book value	140,000	88,000
Fair value	140,479	88,383
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances	52,000	'
Payments/Payoffs	0	'
Adjustments to fair value	$96	'

Indebtedness_Secured_Debt_Deta

Indebtedness Secured Debt (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Debt Instrument [Line Items]	'	'
Repayments of Secured Debt	$93,036	$112,097
Fixed Rate Secured Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum	2.20%	'
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum	4.40%	'
Number of secured loans repaid	7	'
Repayments of Secured Debt	$82,800	'
Repaid Debt, Weighted Average Interest Rate	5.55%	'

Indebtedness_Unsecured_Debt_De

Indebtedness Unsecured Debt (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified			Variable Rate UnSecured Debt [Member] [Member]	Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]	'	'	'	'
Number of Variable Rate Unsecured Loans	'	'	1	'
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum	'	'	'	99.00%
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum	'	'	'	125.00%
Long-term Debt	$4,208,547	$4,254,376	$250,000	'
Debt Instrument, Interest Rate, Effective Percentage	'	'	1.31%	'
Debt Instrument, Covenant Compliance	'	'	'	'We were in compliance with all such covenants at September 30, 2014

Indebtedness_Unsecured_Line_of

Indebtedness (Unsecured Line of Credit) (Details) (Unsecured Line of Credit DRLP [Member], USD $)	9 Months Ended
	Sep. 30, 2014
Line of Credit Facility, Maximum Borrowing Capacity	$1,250,000,000
Line of Credit Facility, Covenant Compliance	'we were in compliance with all covenants under this line of credit.
Current Market Rate Of Unsecured Lines Of Credit	1.41%
Borrowing capacity of unsecured line of credit	850,000,000
Maturity date	1-Dec-15
Line of Credit Facility Increase	400,000,000
Line of credit balance	$140,000,000
London Interbank Offered Rate (LIBOR) [Member]	'
Debt Instrument, Description of Variable Rate Basis	'LIBOR
Debt Instrument, Basis Spread on Variable Rate	1.25%
Line of Credit Facility, Interest Rate at Period End	1.41%

Shareholders_Equity_Preferred_

Shareholders' Equity Preferred Stock (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Class of Stock [Line Items]	'	'	'	'
Payments for Repurchase of Redeemable Preferred Stock	'	'	$113,797,000	$177,955,000
Other Preferred Stock Dividends and Adjustments	-3,196,000	0	-2,713,000	-5,932,000
Cumulative Preferred Stock [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Stock Repurchased During Period, Shares	'	'	750,243	'
Stock Repurchased During Period, Value	'	'	18,800,000	'
Payments for Repurchase of Redeemable Preferred Stock	'	'	17,700,000	'
Issuance Costs [Member] | Cumulative Preferred Stock [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Other Preferred Stock Dividends and Adjustments	'	'	-618,000	'
Gain (Loss) Repurchase of Redeemable Preferred Shares (Member) | Cumulative Preferred Stock [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Other Preferred Stock Dividends and Adjustments	'	'	483,000	'
Series J Preferred Stock [Member] | Cumulative Preferred Stock [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Preferred Stock, Dividend Rate, Percentage	'	'	6.63%	'
Preferred Stock, Redemption Price Per Share	$250	'	$250	'
Stock Redeemed or Called During Period, Shares	'	'	384,530	'
Payments for Repurchase of Redeemable Preferred Stock	'	'	96,100,000	'
Other Preferred Stock Dividends and Adjustments	'	'	($3,200,000)	'

Shareholders_Equity_Shareholde

Shareholders' Equity Shareholders' Equity (Details) (USD $)	9 Months Ended					9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Apr. 30, 2014	Apr. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
				Prior to Increase Approved by Shareholders [Member]	After Increase Approved by Shareholders [Member]	At-the-market equity issuance [Member]	At-the-market equity issuance [Member]
							Gross Proceeds [Member]
Stock Issued During Period, Shares, New Issues	'	'	'	'	'	14,600,000	'
Issuance of common shares	$255,962	$632,531	'	'	'	$256,000	$258,600
Common Stock, Shares Authorized	600,000,000	'	400,000,000	400,000,000	600,000,000	'	'

Related_Party_Transactions_Sch

Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Management Fees [Member]	'	'	'	'
Revenue from related party transactions	$2,233	$2,246	$6,569	$6,872
Leasing Fees [Member]	'	'	'	'
Revenue from related party transactions	572	310	3,085	1,432
Construction and Development Fees [Member]	'	'	'	'
Revenue from related party transactions	$1,529	$681	$4,911	$3,258

Net_Income_Loss_Per_Common_Sha2

Net Income (Loss) Per Common Share Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Net income (loss) attributable to common shareholders/unitholders	$61,533	($6,067)	$207,904	$83,470
Less: Dividends on Participating Securities	-651	-650	-1,941	-2,024
Basic Net Income (Loss) Attributable To Common Stockholders	60,882	-6,717	205,963	81,446
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	795	0	2,738	1,142
Diluted Net Income (Loss) Attributable to Common Stockholders	61,677	-6,717	208,701	82,588
Weighted average number of common shares/units outstanding	341,165	324,895	333,393	320,810
Weighted Average Limited Partnership Units Outstanding	4,380	0	4,384	4,393
Other potential dilutive shares/units	281	0	280	177
Weighted average number of common shares/units and potential dilutive securities	345,826	324,895	338,057	325,380
Duke Realty Limited Partnership [Member]	'	'	'	'
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]	'	'	'	'
Net income (loss) attributable to common shareholders/unitholders	62,328	-6,159	210,642	84,612
Less: Dividends on Participating Securities	-651	-650	-1,941	-2,024
Basic Net Income (Loss) Attributable To Common Stockholders	$61,677	($6,809)	$208,701	$82,588
Weighted average number of common shares/units outstanding	345,545	329,283	337,777	325,203
Other potential dilutive shares/units	281	0	280	177
Weighted average number of common shares/units and potential dilutive securities	345,826	329,283	338,057	325,380

Net_Income_Loss_Per_Common_Sha3

Net Income (Loss) Per Common Share (Computation of Anti-Dilutive Common Shares) (Details)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock Option [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities	1,215	1,373	1,215	1,373
Participating Securities [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Anti-dilutive securities	3,867	3,866	3,867	3,866

Segment_Reporting_Summary_of_R

Segment Reporting Summary of Revenues (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Number of Reportable Segments	'	'	4	'
Rental and related revenue	$231,322	$221,655	$702,190	$646,842
General contractor and service fee revenue	59,739	62,807	185,072	161,004
Revenues	291,061	284,462	887,262	807,846
Disposal Group, Including Discontinued Operation, Revenue	454	11,140	2,415	39,807
Total Revenues Including Revenues Related To Discontinued Operations	291,515	295,602	889,677	847,653
Operating Segments [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Revenues	290,036	282,877	883,910	803,823
Operating Segments [Member] | Industrial [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Rental and related revenue	131,212	122,643	394,209	354,468
Operating Segments [Member] | Office [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Rental and related revenue	60,672	63,120	194,236	187,973
Operating Segments [Member] | Medical Office [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Rental and related revenue	36,715	32,542	104,979	94,571
Operating Segments [Member] | All Other Segments [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Rental and related revenue	1,698	1,765	5,414	5,807
Operating Segments [Member] | Service Operations [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
General contractor and service fee revenue	59,739	62,807	185,072	161,004
Corporate, Non-Segment [Member]	'	'	'	'
Segment Reporting, Revenue Reconciling Item [Line Items]	'	'	'	'
Rental and related revenue	1,025	1,585	3,352	4,023
Disposal Group, Including Discontinued Operation, Revenue	$454	$11,140	$2,415	$39,807

Segment_Reporting_Summary_of_N

Segment Reporting (Summary of Net Operating Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Straight line rental income and expenses, net	'	'	$16,419	$12,421
Income (Loss) from Equity Method Investments	19,178	-27	82,325	50,442
Interest expense	-53,343	-56,618	-163,479	-171,365
Depreciation and amortization on continuing operations	-95,000	-101,191	-290,700	-289,508
Gains on depreciated property sales on continuing operations	47,143	0	133,617	1,108
Asset Impairment Charges	-6,368	0	-8,891	-3,777
Interest and other income, net	356	145	936	1,219
Other Operating Income (Expense), Net	-56	-47	-277	-150
General and administrative expenses	-10,573	-10,373	-35,632	-33,225
Earnings from sales of land	3,167	3,365	7,208	3,365
Undeveloped land carrying costs	-1,773	-2,108	-5,755	-6,837
Gains (Losses) on Extinguishment of Debt	0	0	-139	0
Acquisition-related activity	-110	-726	-871	-2,506
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	69,976	-13,102	216,133	8,195
Operating Segments [Member]	'	'	'	'
Property Level Net Operating Income b Cash Basis	156,375	139,276	453,254	404,710
Operating Segments [Member] | Industrial [Member]	'	'	'	'
Property Level Net Operating Income b Cash Basis	97,324	88,968	284,191	254,849
Operating Segments [Member] | Office [Member]	'	'	'	'
Property Level Net Operating Income b Cash Basis	34,894	30,982	100,237	94,959
Operating Segments [Member] | Medical Office [Member]	'	'	'	'
Property Level Net Operating Income b Cash Basis	23,228	18,239	65,592	51,764
Operating Segments [Member] | All Other Segments [Member]	'	'	'	'
Property Level Net Operating Income b Cash Basis	929	1,087	3,234	3,138
Operating Segments [Member] | Service Operations [Member]	'	'	'	'
Service Operations Net Income (loss)	7,211	3,415	21,415	18,079
Segment Reconciling Items [Member]	'	'	'	'
Straight line rental income and expenses, net	5,527	2,942	16,929	11,040
Revenues Related to Lease Buyouts	145	2,936	4,365	9,615
Amortization of lease incentives and market rents	-1,220	-2,267	-5,376	-6,485
Intercompany rents and other adjusting items	-1,221	-1,125	-3,323	-3,470
Sold Properties Included in Continuing Operations Net Operating Income	807	9,332	11,568	25,449
Corporate, Non-Segment [Member]	'	'	'	'
Income (Loss) from Equity Method Investments	19,178	-27	82,325	50,442
Interest expense	-53,343	-56,618	-163,479	-171,365
Depreciation and amortization on continuing operations	-95,000	-101,191	-290,700	-289,508
Gains on depreciated property sales on continuing operations	47,143	0	133,617	1,108
Asset Impairment Charges	-6,368	0	-8,891	-3,777
Interest and other income, net	356	145	936	1,219
Other Operating Income (Expense), Net	-56	-47	-277	-150
General and administrative expenses	-10,573	-10,373	-35,632	-33,225
Earnings from sales of land	3,167	3,365	7,208	3,365
Undeveloped land carrying costs	-1,773	-2,108	-5,755	-6,837
Gains (Losses) on Extinguishment of Debt	0	0	-139	0
Acquisition-related activity	-110	-726	-871	-2,506
Other non-segment income	($269)	($31)	($1,041)	$491

Segment_Reporting_Reportable_S

Segment Reporting (Reportable Segments Consolidated Assets) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Total Assets	$7,884,195	$7,752,614
Corporate, Non-Segment [Member]	'	'
Total Assets	425,439	416,675
Operating Segments [Member]	'	'
Total Assets	7,458,756	7,335,939
Operating Segments [Member] | Industrial [Member]	'	'
Total Assets	4,673,507	4,414,740
Operating Segments [Member] | Office [Member]	'	'
Total Assets	1,378,083	1,524,501
Operating Segments [Member] | Medical Office [Member]	'	'
Total Assets	1,172,615	1,170,420
Operating Segments [Member] | All Other Segments [Member]	'	'
Total Assets	76,736	81,056
Operating Segments [Member] | Service Operations [Member]	'	'
Total Assets	$157,815	$145,222

Discontinued_Operations_Assets2

Discontinued Operations, Assets Held for Sale and Impairments (Table Illustration of Number of Properties in Discontinued Operations) (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
	buildings	buildings	buildings	buildings
Number of properties held for sale in discontinued operations	'	3	1	'
Number of properties sold in discontinued operations	2	'	12	25
Total number of properties in discontinued operations	'	'	38	'
Continuing Operations, Number of In-service Properties Held for Sale	'	'	2	'
Continuing Operations, Number of Real Estate Properties Sold	'	'	11	13
Continuing Operations, Number of Real Estate Properties Sold or Classified as Held for Sale	'	'	26	'
Number of Real Estate Properties Held for Sale	'	'	3	'
Number of Real Estate Properties Sold	'	'	23	38
Total Properties Sold or Classified as Held for Sale	'	'	64	'
Industrial [Member]	'	'	'	'
Number of properties held for sale in discontinued operations	'	'	0	'
Number of properties sold in discontinued operations	'	'	11	6
Total number of properties in discontinued operations	'	'	17	'
Office [Member]	'	'	'	'
Number of properties held for sale in discontinued operations	'	'	0	'
Number of properties sold in discontinued operations	'	'	0	12
Total number of properties in discontinued operations	'	'	12	'
Medical Office [Member]	'	'	'	'
Number of properties held for sale in discontinued operations	'	'	1	'
Number of properties sold in discontinued operations	'	'	1	6
Total number of properties in discontinued operations	'	'	8	'
Retail [Member]	'	'	'	'
Number of properties held for sale in discontinued operations	'	'	0	'
Number of properties sold in discontinued operations	'	'	0	1
Total number of properties in discontinued operations	'	'	1	'

Discontinued_Operations_Assets3

Discontinued Operations, Assets Held for Sale and Impairments (Table Illustration of Discontinued Operations in Income Statement) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations	'	'	'	'
Revenues	$454	$11,140	$2,415	$39,807
Operating Expenses	-297	-4,144	-1,282	-14,983
Depreciation and amortization, discontinued operations	0	-3,247	-205	-13,969
Operating Income (Loss)	157	3,749	928	10,855
Interest Expense	-137	-2,251	-706	-9,310
Income (loss) before gain on sales	20	1,498	222	1,545
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	564	8,441	22,864	101,052
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	584	9,939	23,086	102,597
Discontinued Operation, Tax Effect of Discontinued Operation	555	0	-2,969	0
Income (loss) from discontinued operations	1,139	9,939	20,117	102,597
Income Tax Benefit (Expense)	$442	$4,500	($2,595)	$4,500

Discontinued_Operations_Assets4

Discontinued Operations, Assets Held for Sale and Impairments (Allocation of Shareholders' Income (Loss) Between Continuing and Discontinued Operations) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations	'	'	'	'
Income (loss) from continuing operations attributable to common shareholders	$60,408	($15,874)	$188,048	($17,741)
Income (loss) from discontinued operations attributable to common shareholders	1,125	9,807	19,856	101,211
Net income (loss) attributable to common shareholders/unitholders	$61,533	($6,067)	$207,904	$83,470

Discontinued_Operations_Assets5

Discontinued Operations, Assets Held for Sale and Impairments (Aggregate Balance Sheet of Properties Held for Sale Included in Discontinued Operations) (Details) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2014
	buildings	buildings
Discontinued Operations	'	'
Discontinued Operation, Number of Real Estate Properties Held for Sale	3	1
Continuing Operations, Number of In-service Properties Held for Sale	'	2
Real estate investment, net	'	$29,583
Other assets	'	5,831
Total assets held-for-sale	'	35,414
Accrued expenses	'	618
Other liabilities	'	87
Total liabilities held-for-sale	'	705
Continuing Operations [Member]	'	'
Discontinued Operations	'	'
Real estate investment, net	'	14,940
Other assets	'	473
Total assets held-for-sale	'	15,413
Accrued expenses	'	356
Other liabilities	'	87
Total liabilities held-for-sale	'	443
Discontinued Operations [Member]	'	'
Discontinued Operations	'	'
Real estate investment, net	'	14,643
Other assets	'	5,358
Total assets held-for-sale	'	20,001
Accrued expenses	'	262
Other liabilities	'	0
Total liabilities held-for-sale	'	$262

Discontinued_Operations_Assets6

Discontinued Operations, Assets Held for Sale and Impairments Impairment (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Asset Impairment Charges	$6,368	$0	$8,891	$3,777
Land [Member]	'	'	'	'
Asset Impairment Charges	5,915	0	8,438	3,777
Building [Member]	'	'	'	'
Asset Impairment Charges	$453	$0	$453	$0

Subsequent_Events_Details

Subsequent Events (Details) (USD $)	3 Months Ended				9 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Oct. 09, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2014
	Declaration of Dividends [Member]	Declaration of Dividends [Member]	Declaration of Dividends [Member]	Declaration of Dividends [Member]	Unsecured Line of Credit DRLP [Member]	Unsecured Line of Credit DRLP [Member]	Unsecured Line of Credit DRLP [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	Variable Rate UnSecured Debt [Member] [Member]
		Common Stock [Member]	Series K Preferred Stock [Member]	Series L Preferred Stock [Member]		Subsequent Event [Member]	Subsequent Event [Member]	Unsecured Line of Credit DRLP [Member]	Unsecured Line of Credit DRLP [Member]	London Interbank Offered Rate (LIBOR) [Member]
									Subsequent Event [Member]	Subsequent Event [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'	'	'
Line of Credit Facility, Expiration Date	'	'	'	'	1-Dec-15	1-Jan-19	'	'	'	'
Line of Credit Facility, Current Borrowing Capacity	'	'	'	'	$850,000,000	'	$1,200,000,000	'	'	'
Line of Credit Facility Increase	'	'	'	'	400,000,000	'	'	'	'	'
Line of Credit Facility, Maximum Borrowing Capacity	'	'	'	'	$1,250,000,000	'	$1,600,000,000	'	'	'
Debt Instrument, Description of Variable Rate Basis	'	'	'	'	'	'	'	'LIBOR	'LIBOR	'LIBOR
Debt Instrument, Basis Spread on Variable Rate	'	'	'	'	'	'	'	1.25%	1.05%	1.15%
Debt Instrument, Maturity Date	'	'	'	'	'	1-Jan-19	'	'	'	'
Common stock dividends declared per share	'	$0.17	'	'	'	'	'	'	'	'
Preferred stock dividends declared per share	'	'	$0.41	$0.41	'	'	'	'	'	'
Record date	'	14-Nov-14	14-Nov-14	14-Nov-14	'	'	'	'	'	'
Payment date	'	28-Nov-14	28-Nov-14	28-Nov-14	'	'	'	'	'	'
Declared date	29-Oct-14	'	'	'	'	'	'	'	'	'