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Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Carrying Amount of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Beginning balance $ 6,644,249 $ 6,507,484 $ 5,976,526
Acquisitions 505,257 255,848 597,751
Improvements, capitalized costs 364,721 330,809 296,399
Total additions during period 869,978 586,657 894,150
Disposal (fully depreciated assets and early terminations) (27,821) (41,337) (27,451)
Cost of property sold (426,869) (408,555) (335,741)
Total deductions during period (454,690) (449,892) (363,192)
Ending balance 7,059,537 6,644,249 6,507,484
Reclassification to assets associated with real estate held for sale 0 (424,888) (629,004)
Total investment in real estate, end of year 7,059,537 6,219,361 5,878,480
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]      
Total accumulated depreciation, beginning of year (549,411) (423,950) (272,724)
Depreciation of real estate (203,347) (206,838) (182,219)
Total additions during period 203,347 206,838 182,219
Deletions 27,410 37,925 25,622
Write-offs due to sale 29,717 43,452 5,371
Total deductions during period 57,127 81,377 30,993
Ending balance, before reclassification to assets associated with real estate held for sale (695,631) (549,411) (423,950)
Ending balance, before reclassification to assets associated with real estate held for sale (695,631) (549,411) (423,950)
Reclassification to assets associated with real estate held for sale 0 28,041 48,743
Total accumulated depreciation, end of year $ (695,631) $ (521,370) $ (375,207)