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Fair Value of Assets and Liabilities (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
item
building
shares
Dec. 31, 2015
USD ($)
Assets and liabilities measured at fair value    
Senior unsecured notes $ 1,720,714 $ 1,478,536
Secured mortgage debt and capital leases $ 669,314 679,295
Number of public issues of unsecured senior notes | item 6  
Carrying value    
Assets and liabilities measured at fair value    
Senior unsecured notes $ 1,720,714 1,478,536
Secured mortgage debt and capital leases 669,314 679,295
Debt Instrument 2,390,028 2,157,831
Fair value    
Assets and liabilities measured at fair value    
Senior unsecured notes 1,771,365 1,548,613
Secured mortgage debt and capital leases 715,740 724,615
Debt Instrument $ 2,487,105 $ 2,273,228
MOBs    
Assets and liabilities measured at fair value    
Number of buildings classified as held for sale | building 1  
Recurring    
Assets and liabilities measured at fair value    
Investments in available for sale securities $ 75,660  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets and liabilities measured at fair value    
Investments in available for sale securities 75,660  
Nonrecurring    
Assets and liabilities measured at fair value    
Assets held for sale 2,421  
Nonrecurring | Significant Unobservable Inputs (Level 3)    
Assets and liabilities measured at fair value    
Assets held for sale $ 2,421  
Five Star    
Assets and liabilities measured at fair value    
Investment in common shares | shares 4,235,000  
Five Star | Common Shares    
Assets and liabilities measured at fair value    
Investment in common shares | shares 4,235,000  
Amount of investment acquired $ 14,230  
Unrealized loss $ 4,532  
RMR Inc | Class A common shares    
Assets and liabilities measured at fair value    
Investment in common shares | shares 2,637,408  
Amount of investment acquired $ 69,826  
Unrealized loss $ 3,864