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Schedule III - Reconciliation of Carrying Amount of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance $ 6,507,484 $ 5,976,526 $ 2,239,741
Acquisitions 255,848 597,751 3,699,289
Improvements, capitalized costs 330,809 296,399 198,561
Total additions during period 586,657 894,150 3,897,850
Disposal (fully depreciated assets and early terminations)   (27,451) (13,556)
Cost of property sold   (335,741) (147,509)
Total deductions during period (449,892) (363,192) (161,065)
Beginning balance 6,644,249 6,507,484 5,976,526
Reclassification to assets associated with real estate held for sale (220,808) (629,004) (353,067)
Total investment in real estate, end of year 6,423,441 5,878,480 5,623,459
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Total accumulated depreciation, beginning of year (423,950) (272,724) (142,561)
Depreciation of real estate (206,838) (182,219) (151,066)
Total additions during period (206,838) (182,219) (151,066)
Deletions 37,925 25,622 12,999
Write-offs due to sale 43,452 5,371 7,904
Total deductions during period 81,377 30,993 20,903
Ending balance, before reclassification to assets associated with real estate held for sale (549,411) (423,950) (272,724)
Reclassification to assets associated with real estate held for sale 15,913 48,743 8,865
Total accumulated depreciation, end of year $ (533,498) $ (375,207) $ (263,859)