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Summary of Significant Accounting Policies - Investments (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment in available for sale securities          
Unrealized gains (losses) on equity securities, net     $ (20,724) $ 0 $ 0
Impairment of assets     66,346 $ 5,082 $ 18,674
Five Star          
Investment in available for sale securities          
Investment in common shares (in shares)       4,235,000  
Impairment of assets   $ 2,795      
Weighted average quoted market prices (in dollars per share)         $ 2.70
RMR Inc.          
Investment in available for sale securities          
Investment, difference between carrying value and fair value     3,772 $ 3,772 $ 3,772
Unamortized liability for excess of fair value to carrying value     64,390    
RMR Inc.          
Investment in available for sale securities          
Fair value of investment     139,994 156,398  
Unrealized gains (losses) on equity securities, net     $ 70,168 $ 86,572  
RMR Inc. | Class A common shares          
Investment in available for sale securities          
Investment in common shares (in shares)     2,637,408 2,637,408  
Cost basis for shares owned     $ 69,826 $ 69,826  
Unrealized gains (losses) on equity securities, net     $ (16,404)    
Five Star          
Investment in available for sale securities          
Investment in common shares (in shares)     4,235,000    
Fair value of investment     $ 2,033 6,353  
Unrealized gains (losses) on equity securities, net     $ (4,320) $ 0  
Impairment of assets $ 5,082        
Five Star | Common Shares          
Investment in available for sale securities          
Investment in common shares (in shares)     4,235,000    
Cost basis for shares owned     $ 6,353