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Schedule III - Real Estate Assets and Accumulated Depreciation (Details) - Schedule III - Reconciliation of Real Estate Owned - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]    
Balance at January 1 $ 2,329,080 $ 2,116,480
Real estate acquisitions 1,021,204 219,053
Net additions to/improvements of real estate 40,192 26,369
Real estate dispositions (5,505) (32,822)
Balance at December 31 $ 3,384,971 $ 2,329,080