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Segment Reporting (Summary of Net Operating Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Straight line rental income and expenses, net $ 8,819dre_Straightlinerentadjustmentsnet $ 5,974dre_Straightlinerentadjustmentsnet
Income (Loss) from Equity Method Investments 6,246us-gaap_IncomeLossFromEquityMethodInvestments 2,321us-gaap_IncomeLossFromEquityMethodInvestments
Interest expense (49,610)us-gaap_InterestExpense (49,261)us-gaap_InterestExpense
Depreciation and amortization on continuing operations (81,903)us-gaap_DepreciationAndAmortization (88,298)us-gaap_DepreciationAndAmortization
Gain on sale of properties 23,484us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal 15,853us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Interest and other income, net 338us-gaap_OtherNonoperatingIncomeExpense 351us-gaap_OtherNonoperatingIncomeExpense
General and administrative expenses (17,004)us-gaap_GeneralAndAdministrativeExpense (14,694)us-gaap_GeneralAndAdministrativeExpense
Gain on land sales 5,425dre_EarningsFromSalesOfLand 152dre_EarningsFromSalesOfLand
Other operating expenses (1,557)us-gaap_OtherOperatingIncomeExpenseNet (2,216)us-gaap_OtherOperatingIncomeExpenseNet
Acquisition-related activity (28)dre_Acquisitionrelatedactivity (14)dre_Acquisitionrelatedactivity
Income from continuing operations before income taxes 38,900us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 10,145us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Operating Segments [Member]    
Property Level Net Operating Income – Cash Basis 136,758dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
121,955dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Property Level Net Income, Cash Basis, Continuing Operations 142,997dre_PropertyLevelNetIncomeCashBasisContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
134,378dre_PropertyLevelNetIncomeCashBasisContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Industrial [Member]    
Property Level Net Operating Income – Cash Basis 96,684dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_WarehouseMember
85,691dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_WarehouseMember
Operating Segments [Member] | Office [Member]    
Property Level Net Operating Income – Cash Basis 14,842dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OfficeBuildingMember
15,206dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OfficeBuildingMember
Operating Segments [Member] | Medical Office [Member]    
Property Level Net Operating Income – Cash Basis 25,232dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= dre_MedicalOfficeMember
20,805dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= dre_MedicalOfficeMember
Operating Segments [Member] | All Other Segments [Member]    
Property Level Net Operating Income – Cash Basis 0dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
253dre_PropertyLevelNetOperatingIncomeCashBasis
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating Segments [Member] | Service Operations [Member]    
Service Operations Net Income (loss) 5,797dre_ServiceOperationsNetIncomeloss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= dre_ServiceOperationsMember
8,549dre_ServiceOperationsNetIncomeloss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= dre_ServiceOperationsMember
Segment Reconciling Items [Member]    
Straight line rental income and expenses, net 6,697dre_Straightlinerentadjustmentsnet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
4,769dre_Straightlinerentadjustmentsnet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Revenues Related to Lease Buyouts 864us-gaap_GainLossOnContractTermination
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
2,695us-gaap_GainLossOnContractTermination
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Amortization of lease incentives and market rents (1,713)dre_Amortizationofleaseincentivesandmarketrents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(2,211)dre_Amortizationofleaseincentivesandmarketrents
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Intercompany rents and other adjusting items (731)dre_Intercompanyrentsandotheradjustingitems
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
(1,537)dre_Intercompanyrentsandotheradjustingitems
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Sold Properties Included in Continuing Operations Net Operating Income 6,239dre_SoldPropertiesIncludedinContinuingOperationsNetOperatingIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
12,423dre_SoldPropertiesIncludedinContinuingOperationsNetOperatingIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_MaterialReconcilingItemsMember
Corporate, Non-Segment [Member]    
Income (Loss) from Equity Method Investments 6,246us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
2,321us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Interest expense (49,610)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(49,261)us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Depreciation and amortization on continuing operations (81,903)us-gaap_DepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(88,298)us-gaap_DepreciationAndAmortization
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Gain on sale of properties 23,484us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
15,853us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Interest and other income, net 338us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
351us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
General and administrative expenses (17,004)us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(14,694)us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Gain on land sales 5,425dre_EarningsFromSalesOfLand
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
152dre_EarningsFromSalesOfLand
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Other operating expenses (1,557)us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(2,216)us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Acquisition-related activity (28)dre_Acquisitionrelatedactivity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
(14)dre_Acquisitionrelatedactivity
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Other non-segment income $ (402)dre_OtherNonSegmentIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ (692)dre_OtherNonSegmentIncome
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember