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Fair Value of Assets and Liabilities (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
note
property
shares
Jun. 30, 2016
property
Dec. 31, 2015
USD ($)
Assets and liabilities measured at fair value      
Number of public issues of unsecured senior notes | note 6    
Senior unsecured notes $ 1,722,032   $ 1,478,536
Secured mortgage debt and capital leases 1,168,827   679,295
Carrying value      
Assets and liabilities measured at fair value      
Senior unsecured notes 1,722,032   1,478,536
Secured mortgage debt and capital leases 1,168,827   679,295
Debt Instrument 2,890,859   2,157,831
Fair value      
Assets and liabilities measured at fair value      
Senior unsecured notes 1,830,935   1,548,613
Secured mortgage debt and capital leases 1,195,240   724,615
Debt Instrument $ 3,026,175   $ 2,273,228
MOBs      
Assets and liabilities measured at fair value      
Number of properties classified as held for sale | property 2 5  
Five Star      
Assets and liabilities measured at fair value      
Investment in common shares (in shares) | shares 4,235,000    
Five Star | Common Shares      
Assets and liabilities measured at fair value      
Investment in common shares (in shares) | shares 4,235,000    
Amount of investment acquired $ 14,230    
Unrealized loss $ 6,141    
RMR Inc | Class A common shares      
Assets and liabilities measured at fair value      
Investment in common shares (in shares) | shares 2,637,408    
Amount of investment acquired $ 69,826    
Unrealized gain 30,237    
Recurring      
Assets and liabilities measured at fair value      
Investments in available for sale securities 108,152    
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets and liabilities measured at fair value      
Investments in available for sale securities 108,152    
Recurring | Significant Unobservable Inputs (Level 3)      
Assets and liabilities measured at fair value      
Investments in available for sale securities 0    
Nonrecurring      
Assets and liabilities measured at fair value      
Assets held for sale 3,627    
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets and liabilities measured at fair value      
Assets held for sale 0    
Nonrecurring | Significant Unobservable Inputs (Level 3)      
Assets and liabilities measured at fair value      
Assets held for sale $ 3,627