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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, 2016
Dec. 31, 2015
Dec. 31, 2014
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance $ 5,976,526 $ 2,239,741 $ 2,035,330
Acquisitions 597,751 3,699,289 114,008
Improvements, capitalized costs 296,399 198,561 128,018
Total additions during period 894,150 3,897,850 242,026
Disposal (fully depreciated assets and early terminations) (27,451) (13,556) (23,977)
Cost of property sold (335,741) (147,509) (13,638)
Total deductions during period (363,192) (161,065) (37,615)
Ending balance, before reclassification to assets associated with real estate held for sale 6,507,484 5,976,526 2,239,741
Reclassification to assets associated with real estate held for sale (37,183) (353,067) (68,446)
Total investment in real estate, end of year 6,470,301 5,623,459 2,171,295
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Total accumulated depreciation, beginning of year (272,724) (142,561) (116,342)
Depreciation of real estate (182,219) (151,066) (50,044)
Total additions during period (182,219) (151,066) (50,044)
Deletions 25,622 12,999 22,310
Write-offs due to sale 5,371 7,904 1,515
Total deductions during period 30,993 20,903 23,825
Ending balance, before reclassification to assets associated with real estate held for sale (423,950) (272,724) (142,561)
Reclassification to assets associated with real estate held for sale 4,582 8,865 7,904
Total accumulated depreciation, end of year $ 419,368 $ 263,859 $ 134,657