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Acquisitions, Dispositions and Other Significant Transactions - Welltower Lease and RIDA Venture Restructuring (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
community
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
lease
community
Jun. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
lease
community
Business Acquisition [Line Items]            
Payments for lease termination         $ 0 $ 12,548
Loss on facility lease termination and modification, net   $ 0 $ (2,337)   $ (2,006) $ (148,804)
Master leases not renewed, number of communities | community     11     11
Welltower Lease Transactions            
Business Acquisition [Line Items]            
Number Of Leases Not Renewed | lease     2     2
Welltower Inc. | Welltower Lease Transactions            
Business Acquisition [Line Items]            
Payments for lease termination       $ 58,000    
Loss on facility lease termination and modification, net       22,600    
Proceeds from sale of equity method investment       33,500    
Gain on sale of equity method investment       $ 14,700    
Potential lease terminations, rent credit percentage 6.25%          
Welltower Inc. | Welltower Lease Transactions | Maximum            
Business Acquisition [Line Items]            
Operating leases, rent expense $ 5,000          
Welltower RIDEA            
Business Acquisition [Line Items]            
Percentage ownership 20.00%     20.00%    
37 Communities Disposed Of Through Lease Terminations | Welltower Lease Transactions            
Business Acquisition [Line Items]            
Number of communities disposed of | community 37