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Summary of Significant Accounting Policies - Investments (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Jun. 30, 2020
shares
Investment in available for sale securities          
Unrealized gains and losses on equity securities held   $ 34,106 $ (462)    
Class A common shares | RMR Inc.          
Investment in available for sale securities          
Investment in common shares (in shares) | shares         2,637,408
Five Star          
Investment in available for sale securities          
Shares issued, value   $ 59,801 0 $ 0  
Five Star | Common Shares          
Investment in available for sale securities          
Issued (in shares) | shares 10,268,158        
Five Star          
Investment in available for sale securities          
Investment in common shares (in shares) | shares   10,691,658      
Unrealized gains and losses on equity securities held     462    
Five Star | Recurring          
Investment in available for sale securities          
Investments in Five Star   $ 73,772 $ 1,571    
Five Star | Common Shares          
Investment in available for sale securities          
Investment in common shares (in shares) | shares   10,691,658 423,500    
Reverse stock split ratio   0.100      
Shares issued, value $ 38,095        
Cost basis for shares owned   $ 44,448