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Real Estate - Components of Property Operating Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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