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Schedule III - Real Estate and Accumulated Depreciation Reconciliation of Investment Properties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance, beginning of year $ 2,139,863 $ 1,649,423 $ 939,330
Acquisition of new properties 0 354,429 607,779
Improvements 156,754 143,315 130,346
Distribution of real property to owners prior to the formation transactions 0 0 (16,345)
Disposals (20,287) (7,304) (11,687)
Balance, end of year 2,276,330 $ 2,139,863 $ 1,649,423
Aggregate cost of investment properties for federal income tax purpose $ 1,964,637