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Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Change in total real estate assets      
Balance, beginning of period $ 3,923,624us-gaap_RealEstateGrossAtCarryingValue $ 507,845us-gaap_RealEstateGrossAtCarryingValue $ 3,516us-gaap_RealEstateGrossAtCarryingValue
Acquisitions and building improvements 2,004,742us-gaap_RealEstateOtherAcquisitions 3,423,903us-gaap_RealEstateOtherAcquisitions 504,329us-gaap_RealEstateOtherAcquisitions
Dispositions (11,433)us-gaap_RealEstateCostOfRealEstateSold (8,124)us-gaap_RealEstateCostOfRealEstateSold  
Balance, end of period $ 5,916,933us-gaap_RealEstateGrossAtCarryingValue $ 3,923,624us-gaap_RealEstateGrossAtCarryingValue $ 507,845us-gaap_RealEstateGrossAtCarryingValue