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Property: (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land $ 2,259,288us-gaap_Land $ 2,242,291us-gaap_Land
Buildings and improvements 9,545,712us-gaap_InvestmentBuildingAndBuildingImprovements 9,479,337us-gaap_InvestmentBuildingAndBuildingImprovements
Tenant improvements 612,411us-gaap_TenantImprovements 600,436us-gaap_TenantImprovements
Equipment and furnishings 155,285us-gaap_FixturesAndEquipmentGross 152,554us-gaap_FixturesAndEquipmentGross
Construction in progress 328,905us-gaap_DevelopmentInProcess 303,264us-gaap_DevelopmentInProcess
Total 12,901,601us-gaap_RealEstateInvestmentPropertyAtCost 12,777,882us-gaap_RealEstateInvestmentPropertyAtCost
Less accumulated depreciation (1,790,760)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation (1,709,992)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Property, net $ 11,110,841us-gaap_RealEstateInvestmentPropertyNet $ 11,067,890us-gaap_RealEstateInvestmentPropertyNet