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Acquisitions, Dispositions and Other Significant Transactions - Revenue of Disposal Groups (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Resident fees $ 1,042,044 $ 1,187,234
Communities Disposed Of Through Sale And Lease Terminations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Resident fees 3,718 123,570
Facility operating expense 3,402 84,099
Cash facility lease payments 192 33,500
Communities Disposed Of Through Sale And Lease Terminations | Independent Living    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Resident fees 0 31,629
Facility operating expense 0 18,653
Communities Disposed Of Through Sale And Lease Terminations | Assisted Living and Memory Care    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Resident fees 3,718 85,448
Facility operating expense 3,402 59,389
Communities Disposed Of Through Sale And Lease Terminations | CCRCs    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Resident fees 0 6,493
Facility operating expense $ 0 $ 6,057