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Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets and liabilities measured at fair value        
Investments in available for sale securities $ 115,612 $ 115,612 $ 51,472  
Impairment of assets 2,795 18,674 194 $ (10)
Senior unsecured notes 1,722,758 1,722,758 1,478,536  
Recurring        
Assets and liabilities measured at fair value        
Investments in available for sale securities 115,612 115,612    
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Assets and liabilities measured at fair value        
Investments in available for sale securities $ 115,612 $ 115,612    
Five Star        
Assets and liabilities measured at fair value        
Investment in common shares 4,235,000 4,235,000    
Five Star | Common Shares        
Assets and liabilities measured at fair value        
Investment in common shares 4,235,000 4,235,000    
Amount of investment acquired $ 11,435 $ 11,435    
RMR Inc. | Class A common shares        
Assets and liabilities measured at fair value        
Investment in common shares 2,637,408 2,637,408    
Amount of investment acquired $ 69,826 $ 69,826    
Unrealized gain 34,352 34,352    
Carrying Amount        
Assets and liabilities measured at fair value        
Senior unsecured notes 1,722,758 1,722,758 1,478,536  
Secured debt 1,106,183 1,106,183 667,138  
Secured and secured debt 2,828,941 2,828,941 2,145,674  
Estimated Fair Value        
Assets and liabilities measured at fair value        
Senior unsecured notes 1,755,715 1,755,715 1,548,613  
Secured debt 1,090,515 1,090,515 712,459  
Secured and secured debt $ 2,846,230 $ 2,846,230 $ 2,261,072