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Schedule III - Real Estate and Accumulated Depreciation Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]  
Balance at beginning of the year $ 2,804,609us-gaap_RealEstateGrossAtCarryingValue
Acquistion and development of rental properties during the year 514,016us-gaap_RealEstateOtherAcquisitions
Disposition of rental properties during the year (13,632)us-gaap_RealEstateCostOfRealEstateSold
Balance at close of year 3,304,993us-gaap_RealEstateGrossAtCarryingValue
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]  
Balance at beginning of the year 409,643us-gaap_RealEstateAccumulatedDepreciation
Depreciation during the year 58,983us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense
Disposition of rental properties during the year (2,966)us-gaap_RealEstateAccumulatedDepreciationRealEstateSold
Balance at close of year $ 465,660us-gaap_RealEstateAccumulatedDepreciation