Discontinued Operations and Assets Held for Sale Impairment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 acre buildings	Dec. 31, 2013	Dec. 31, 2012
Impairment Charges	$ 49,106us-gaap_AssetImpairmentCharges	$ 3,777us-gaap_AssetImpairmentCharges	$ 0us-gaap_AssetImpairmentCharges
Acres of Land with Impairment Charge	442dre_AcresofLandwithImpairmentCharge
Number of Real Estate Properties Determined to be Impaired	6
Fair Value Inputs, Cap Rate	8.50%us-gaap_FairValueInputsCapRate
Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot	12.50
buildings [Member]
Impairment Charges	15,406	0
Land [Member]
Impairment Charges	$ 33,700	$ 3,777

Acres of Land with Impairment Charges Recognized During the Reporting Period

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- Definition

Fair Value Measurement With Unobservable Inputs Rental Rate Per Square Foot

+ References

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- Definition

Number of Real Estate Properties Determined to be Impaired.

+ References

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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- Definition

Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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