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Summary of Significant Accounting Policies - Investments (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 05, 2015
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investment in available for sale securities          
Impairment of assets   $ 2,795 $ 18,674 $ 194 $ (10)
Fair value of the investments in available for sale securities   $ 115,612 $ 115,612 $ 51,472  
Five Star          
Investment in available for sale securities          
Investment in common shares   4,235,000 4,235,000 4,235,000  
Impairment of assets   $ 2,795      
Weighted average quoted market prices (in dollars per share)     $ 2.70    
Fair value of the investments in available for sale securities   $ 11,435 $ 11,435 $ 13,467  
Unrealized loss       747  
The RMR Group Inc          
Investment in available for sale securities          
Investment in common shares   2,637,408 2,637,408    
Fair value of the investments in available for sale securities   $ 104,178 $ 104,178 38,005  
Unrealized loss       $ 31,821  
Unrealized gain   34,352 34,352    
Amount of investment acquired   $ 69,826 $ 69,826    
The RMR Group Inc | Class A common shares          
Investment in available for sale securities          
Investment in common shares   2,637,408 2,637,408 2,937,408  
RMR Inc. | Up C Transaction          
Investment in available for sale securities          
Amount of investment acquired $ 60,700        
Fair value of investment $ 136,278        
Investment, difference between carrying value and fair value     $ 3,772 $ 2,145  
Unamortized liability for excess of fair value to carrying value   $ 71,933 $ 71,933    
Class A common shares | RMR Inc. | Up C Transaction          
Investment in available for sale securities          
Number of shares acquired (in shares) 5,272,787