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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, 2015
Dec. 31, 2014
Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Beginning balance $ 2,239,741 $ 2,035,330 $ 1,475,955
Acquisitions 3,699,289 114,008 538,322
Improvements, capitalized costs 198,561 128,018 89,707
Total additions during period 3,897,850 242,026 628,029
Disposal (fully depreciated assets and early terminations) (13,556) (23,977) (9,638)
Cost of property sold (147,509) (13,638) (59,016)
Total deductions during period (161,065) (37,615) (68,654)
Ending Balance 5,976,526 2,239,741 2,035,330
Reclassification to assets associated with real estate held for sale (206,990) (68,446) (82,305)
Total Investment in real estate, end of year 5,769,536 2,171,295 1,953,025
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]      
Ending Balance (142,561) (116,342) (85,184)
Depreciation expense (151,066) (50,044) (41,454)
Total additions during period (151,066) (50,044) (41,454)
Disposals 12,999 22,310 4,837
Write-offs due to sale 7,904 1,515 5,459
Total deductions during period 20,903 23,825 10,296
Ending Balance (272,724) [1] (142,561) (116,342)
Reclassification to assets associated with real estate held for sale 3,650 7,904 7,931
Total Accumulated depreciation $ 269,074 [1] $ 134,657 $ 108,411
[1] The Company computes depreciation using the straight-line method over the estimated useful lives of 39 years for building and improvements, 15 years for land improvements, and over the shorter of asset life or life of the lease for tenant improvements.