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Schedule III - Real Estate and Accumulated Depreciation - Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate      
Balance at beginning of period $ 2,671,854 $ 2,138,500 $ 2,084,642
Real estate before impairments and assets written-off 2,806,757 2,704,668 2,152,859
Less: Impairments and assets sold or written-off (37,765) (32,814) (14,359)
Balance at end of period 2,768,992 2,671,854 2,138,500
Accumulated Depreciation      
Balance at beginning of period 645,872 587,127 541,077
Additions charged to operating expenses 80,578 65,140 42,989
Accumulated depreciation before depreciation of assets written-off 667,705 606,217 552,101
Less: Accumulated depreciation on assets written-off (21,833) (19,090) (11,024)
Balance at end of period 587,127 541,077 509,112
Land      
Real Estate      
Additions during the period: 4,120 142,305 2,667
Buildings & improvements      
Real Estate      
Additions during the period: 12,394 389,338 18,316
Construction in progress      
Real Estate      
Additions during the period: $ 118,389 $ 34,525 $ 47,234