Discontinued Operations and Assets Held for Sale (Aggregate Balance Sheet of Properties Held for Sale Included in Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015 buildings	Dec. 31, 2014
Discontinued Operations
Land and Land Improvements Held-for-Sale	$ 157,385dre_LandandLandImprovementsHeldforSale	$ 148,268dre_LandandLandImprovementsHeldforSale
Buildings and Tenant Improvements Held-for-Sale	871,713	758,323
Inventory, Land Held-for-sale	13,736us-gaap_InventoryLandHeldForSale	12,443us-gaap_InventoryLandHeldForSale
Accumulated Depreciation of Assets Held-for-Sale	(285,349)	(270,340)
Lease Related Assets, Held for Sale	48,778dre_LeaseRelatedAssetsHeldforSale	48,320dre_LeaseRelatedAssetsHeldforSale
Other assets	33,755	28,037
Total assets held-for-sale	840,018	725,051
Disposal Groups, Secured Debt Related to Assets Held for Sale	41,697	40,764
Accrued expenses	11,619	5,413
Other liabilities	11,789	12,915
Total liabilities held-for-sale	65,105	59,092
Discontinued Operation, Number of Real Estate Properties Held for Sale	61
Continuing Operations, Number of In-service Properties Held for Sale	52
Continuing Operations [Member]
Discontinued Operations
Land and Land Improvements Held-for-Sale	36,236	21,347
Buildings and Tenant Improvements Held-for-Sale	168,893	36,925
Inventory, Land Held-for-sale	13,736	12,443
Accumulated Depreciation of Assets Held-for-Sale	(51,217)	(23,071)
Lease Related Assets, Held for Sale	6,626	3,480
Other assets	5,896	562
Total assets held-for-sale	180,170	51,686
Disposal Groups, Secured Debt Related to Assets Held for Sale	1,097	0
Accrued expenses	4,685	233
Other liabilities	2,228	434
Total liabilities held-for-sale	8,010	667
Discontinued Operations [Member]
Discontinued Operations
Land and Land Improvements Held-for-Sale	121,149	126,921
Buildings and Tenant Improvements Held-for-Sale	702,820	721,398
Inventory, Land Held-for-sale	0	0
Accumulated Depreciation of Assets Held-for-Sale	(234,132)	(247,269)
Lease Related Assets, Held for Sale	42,152	44,840
Other assets	27,859	27,475
Total assets held-for-sale	659,848	673,365
Disposal Groups, Secured Debt Related to Assets Held for Sale	40,600	40,764
Accrued expenses	6,934	5,180
Other liabilities	9,561	12,481
Total liabilities held-for-sale	$ 57,095	$ 58,425

Accumulated Depreciation of Assets Held-for-Sale

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- Definition

Buildings and Tenant Improvements Held-for-Sale

+ References

No definition available.

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- Definition

Continuing Operations, Number of In-service Properties Held for Sale

+ References

No definition available.

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- Definition

Total number of real estate properties, classified as held for sale at most recent balance sheet date, classified within discontinued operations

+ References

No definition available.

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- Definition

Disposal Groups, Secured Debt Related to Assets Held for Sale

+ References

No definition available.

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- Definition

Land and Land Improvements Held-for-Sale

+ References

No definition available.

+ Details

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- Definition

This element represents the following, for assets held for sale, 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.

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- Definition

The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

+ References

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- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying value of obligations incurred and payable pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include interest, rent, salaries, and utilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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- Definition

For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified.

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- Definition

For the disposal group, including a component of the entity (discontinued operation), obligations not otherwise itemized.

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- Definition

Carrying amount as of the balance sheet date of parcels of land held for sale, and on which the entity has no intention or no further intention to perform construction activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Subparagraph a

-Article 5

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- Definition

The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

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