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Loans Receivable (Credit Loss Roll Forward) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period   $ 68,372 $ 68,372 $ 68,372
Provision for loan losses   94,436 18,690 0
Loan write-offs   (7,000) (18,690) 0
Foreign currency translation   197 0 0
Reclassification of deferred gain as credit loss $ 62,819 62,819 0 0
Balance at end of period $ 224,036 $ 224,036 $ 68,372 68,372
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201613Member    
Genesis healthcare receivable        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Number of loans | loan 2 2    
Real estate loans receivable, gross $ 62,753 $ 62,753    
Accounting Standards Update 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Accounting Standards Update [Extensible List]     us-gaap:AccountingStandardsUpdate201613Member  
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period   $ 5,212 $ 0 0
Balance at end of period     $ 5,212 $ 0