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Related Party Transactions (Schedule of Fees Earned from Related Parties) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Management Fees [Member]      
Revenue from related party transactions $ 8,530us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_ManagementFeesMember
$ 9,010us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_ManagementFeesMember
$ 11,018us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_ManagementFeesMember
Leasing Fees [Member]      
Revenue from related party transactions 3,410us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_LeasingFeesMember
2,260us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_LeasingFeesMember
3,411us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_LeasingFeesMember
Construction and Development Fees [Member]      
Revenue from related party transactions $ 5,846us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_ConstructionAndDevelopmentFeesMember
$ 5,138us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_ConstructionAndDevelopmentFeesMember
$ 4,739us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dre_ConstructionAndDevelopmentFeesMember