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Real Estate Investments Gross Carrying Value of Company's Properties (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment, Gross [Abstract]    
Land $ 646,132us-gaap_Land $ 669,635us-gaap_Land
Building and improvements 3,313,807us-gaap_BuildingsAndImprovementsGross 3,409,303us-gaap_BuildingsAndImprovementsGross
Tenant improvements 517,918us-gaap_LeaseholdImprovementsGross 524,754us-gaap_LeaseholdImprovementsGross
Real Estate Investments 4,477,857us-gaap_RealEstateInvestmentPropertyAtCost 4,603,692us-gaap_RealEstateInvestmentPropertyAtCost
Assets held for sale - real estate investments 136,802us-gaap_RealEstateHeldforsale [1] 27,436us-gaap_RealEstateHeldforsale [1]
Total $ 4,614,659bdn_RealEstateInvestmentPropertyatCostGrossofHeldForSale $ 4,631,128bdn_RealEstateInvestmentPropertyatCostGrossofHeldForSale
[1] Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.