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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 6 Months Ended
Jun. 30, 2018
USD ($)
community
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
lease
community
Business Acquisition [Line Items]            
Payments for lease termination       $ 0 $ 10,548  
Loss on facility lease termination and modification, net   $ (1,797) $ (146,467) $ (2,006) $ (146,467)  
Master leases not renewed, number of communities | community           11
Welltower Lease Transactions            
Business Acquisition [Line Items]            
Number Of Leases Not Renewed | lease           2
Welltower Lease Transactions | 37 Communities Disposed Of Through Lease Terminations            
Business Acquisition [Line Items]            
Number of communities disposed of | community 37          
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 RIDEA            
Business Acquisition [Line Items]            
Percentage ownership 20.00%   20.00%   20.00%  
Maximum | Welltower Inc. | Welltower Lease Transactions            
Business Acquisition [Line Items]            
Operating leases, rent expense $ 5,000