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Real Estate - Components of Property Operating Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property operating income      
Revenue from External Customer [Line Items]      
Revenue from contract with customer $ 2,247,740 $ 2,113,837 $ 371,082
Rental income      
Revenue from External Customer [Line Items]      
Revenue from contract with customer 623,785 672,292 276,404
Tenant reimbursements      
Revenue from External Customer [Line Items]      
Revenue from contract with customer 143,759 138,433 65,657
Resident fee income      
Revenue from External Customer [Line Items]      
Revenue from contract with customer 275,911 286,818 0
Hotel operating income      
Revenue from External Customer [Line Items]      
Revenue from contract with customer $ 1,204,285 $ 1,016,294 $ 29,021