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Real Estate Investments, Gross Carrying Value of Company's Properties (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Gross carrying value of rental properties      
Land $ 669,635us-gaap_Land $ 680,513us-gaap_Land  
Building and improvements 3,409,303us-gaap_BuildingsAndImprovementsGross 3,504,060us-gaap_BuildingsAndImprovementsGross  
Tenant improvements 524,754us-gaap_LeaseholdImprovementsGross 484,716us-gaap_LeaseholdImprovementsGross  
Rental properties 4,603,692us-gaap_RealEstateInvestmentPropertyAtCost 4,669,289us-gaap_RealEstateInvestmentPropertyAtCost 4,726,169us-gaap_RealEstateInvestmentPropertyAtCost
Real Estate Held-for-sale 27,436us-gaap_RealEstateHeldforsale [1] 0us-gaap_RealEstateHeldforsale [1] 0us-gaap_RealEstateHeldforsale
Real Estate Investment Property, at Cost, Gross of Held For Sale $ 4,631,128bdn_RealEstateInvestmentPropertyatCostGrossofHeldForSale $ 4,669,289bdn_RealEstateInvestmentPropertyatCostGrossofHeldForSale $ 4,726,169bdn_RealEstateInvestmentPropertyatCostGrossofHeldForSale
[1] (a)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.