Summary of Significant Accounting Policies Deferred Leasing and Other Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Deferred Leasing and Other [Abstract]
Deferred Costs, Leasing, Gross	$ 362,438us-gaap_DeferredCostsLeasingGross	$ 477,374us-gaap_DeferredCostsLeasingGross
Finite-Lived Intangible Asset, Acquired-in-Place Leases	325,759	383,654
Deferred Leasing Costs and Finite Lived Intangible Assets Acquired, gross	688,197	861,028
Deferred Costs, Leasing, Accumulated Amortization	(125,754)	(247,081)
Finite-Lived Intangible Assets, Accumulated Amortization	(134,129)	(146,968)
Deferred Costs, Leasing, Net	428,314dre_LeaseRelatedAssets	466,979dre_LeaseRelatedAssets
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	39,127
Finite-Lived Intangible Assets, Amortization Expense, Year Two	33,537
Finite-Lived Intangible Assets, Amortization Expense, Year Three	28,105
Finite-Lived Intangible Assets, Amortization Expense, Year Four	21,674
Finite-Lived Intangible Assets, Amortization Expense, Year Five	17,241
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	44,030
Finite-Lived Intangible Assets, Net	183,714us-gaap_FiniteLivedIntangibleAssetsNet
Net Charge to Rental Income Year One	1,677dre_NetChargetoRentalIncomeYearOne
Net Charge to Rental Income Year Two	1,359dre_NetChargetoRentalIncomeYearTwo
Net Charge to Rental Income Year Three	1,127dre_NetChargetoRentalIncomeYearThree
Net Charge to Rental Income Year Four	980dre_NetChargetoRentalIncomeYear4
Net Charge to Rental Income Year Five	793dre_NetChargetoRentalIncomeYear5
Net Charge to Rental Income After Year Five	1,980
Net Charge to Rental Income	$ 7,916dre_NetChargetoRentalIncome

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Deferred Leasing Costs and Finite Lived Intangible Assets Acquired, gross

+ References

No definition available.

+ Details

Name:	dre_DeferredLeasingCostsandFiniteLivedIntangibleAssetsAcquiredgross
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

This element represents the following, all net of accumulated amortization: (i) the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property; (ii) costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that result directly from and are essential to acquire that lease and would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction; (iii) the identifiable intangible asset established upon acquisition based on a favorable difference between the terms of an acquired lease and the current market terms for that lease at the acquisition date.

+ References

No definition available.

+ Details

Name:	dre_LeaseRelatedAssets
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Net Charge to Rental Income

+ References

No definition available.

+ Details

Name:	dre_NetChargetoRentalIncome
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Net Charge to Rental Income After Year Five

+ References

No definition available.

+ Details

Name:	dre_NetChargetoRentalIncomeAfterYearFive
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Net Charge to Rental Income Year 4

+ References

No definition available.

+ Details

Name:	dre_NetChargetoRentalIncomeYear4
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Data Type:	xbrli:monetaryItemType
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- Definition

Net Charge to Rental Income Year 5

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No definition available.

+ Details

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- Definition

Net Charge to Rental Income Year One

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No definition available.

+ Details

Name:	dre_NetChargetoRentalIncomeYearOne
Namespace Prefix:	dre_
Data Type:	xbrli:monetaryItemType
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- Definition

Net Charge to Rental Income Year Three

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No definition available.

+ Details

Name:	dre_NetChargetoRentalIncomeYearThree
Namespace Prefix:	dre_
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- Definition

Net Charge to Rental Income Year Two

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No definition available.

+ Details

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- Definition

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 35

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6453741&loc=d3e40879-112712

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709

+ Details

Name:	us-gaap_DeferredCostsLeasingAccumulatedAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40246-112709

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=6748888&loc=d3e40588-112709

+ Details

Name:	us-gaap_DeferredCostsLeasingGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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- Definition

Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References