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Investment in Real Estate - Real Estate Investment Property (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investment in real estate            
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      
Disposal (13,556) (23,977) (9,638)      
Cost of property sold (147,509) (13,638) (59,016)      
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 real estate held for investment       5,769,536 2,171,295 1,953,025
Accumulated depreciation            
Beginning balance 142,561 116,342 85,184      
Depreciation expense (151,066) (50,044) (41,454)      
Disposals 12,999 22,310 4,837      
Cost of property sold 7,904 1,515 5,459      
Ending Balance $ 142,561 $ 116,342 $ 85,184 272,724 [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.