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Significant Acquisitions and Dispositions (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]                      
Rental and related revenue $ 238,014,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 231,322,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 233,518,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 237,350,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 226,575,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 221,655,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 215,308,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 209,879,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 940,204,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 873,417,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue $ 770,008,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Operating Income (Loss)                 444,874,000us-gaap_OperatingIncomeLoss 295,283,000us-gaap_OperatingIncomeLoss 147,373,000us-gaap_OperatingIncomeLoss
Business Combination, Acquisition Related Costs                 1,100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 4,100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts 4,200,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain 962,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member] [Member]                      
Business Acquisition [Line Items]                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                 9 years 0 months 13 days    
Rental and related revenue                 5,400,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandFourteenAcquisitionsMemberDomainMemberMember
   
Operating Income (Loss)                 325,000us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandFourteenAcquisitionsMemberDomainMemberMember
   
Other Two Thousand Thirteen Acquisitions [Member] [Domain]                      
Business Acquisition [Line Items]                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life                   7 years 11 months  
Number Of Real Estate Properties Acquired         17dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
        17dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
 
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                   $ 962,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
 
Industrial [Member] | Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member] [Member]                      
Business Acquisition [Line Items]                      
Number Of Real Estate Properties Acquired 4dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandFourteenAcquisitionsMemberDomainMemberMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= us-gaap_WarehouseMember
              4dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandFourteenAcquisitionsMemberDomainMemberMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= us-gaap_WarehouseMember
   
Industrial [Member] | Other Two Thousand Thirteen Acquisitions [Member] [Domain]                      
Business Acquisition [Line Items]                      
Number Of Real Estate Properties Acquired         16dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= us-gaap_WarehouseMember
        16dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= us-gaap_WarehouseMember
 
Medical Office [Member] | Other Two Thousand Fourteen Acquisitions [Member] [Domain] [Member] [Member]                      
Business Acquisition [Line Items]                      
Number Of Real Estate Properties Acquired 1dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandFourteenAcquisitionsMemberDomainMemberMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= dre_MedicalOfficeMember
              1dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandFourteenAcquisitionsMemberDomainMemberMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= dre_MedicalOfficeMember
   
Medical Office [Member] | Other Two Thousand Thirteen Acquisitions [Member] [Domain]                      
Business Acquisition [Line Items]                      
Number Of Real Estate Properties Acquired         1dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= dre_MedicalOfficeMember
        1dre_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= dre_OtherTwoThousandThirteenAcquisitionsMemberDomainMember
/ dre_BusinessAcquisitionRealEstatePropertiesAcquiredAxis
= dre_MedicalOfficeMember