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Fair Value of Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Property
Issuance
Dec. 31, 2011
Assets and liabilities measured at fair value    
Assets held for sale $ 1,715 $ 1,715
Number of properties classified as held for sale 2  
Cumulative impairments of properties held for sale 8,621  
Number of properties in long-lived assets held and used 1  
Impairment of assets charge related to long-lived assets held and used 3,071  
Number of public issues of unsecured senior notes 3  
Senior notes 741,091 965,770
Excess of fair value over book value 45,986  
CommonWealth REIT (CWH)
    
Assets and liabilities measured at fair value    
Investment in common shares 250,000  
Five Star
    
Assets and liabilities measured at fair value    
Investment in common shares 4,235,000  
Recurring | Total
    
Assets and liabilities measured at fair value    
Assets held for sale 1,715  
Long-lived assets held and used 1,986  
Investments in available for sale securities 19,096  
Unsecured senior notes 787,077  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Assets and liabilities measured at fair value    
Investments in available for sale securities 19,096  
Unsecured senior notes 787,077  
Recurring | Significant Other Observable Inputs (Level 2)
    
Assets and liabilities measured at fair value    
Assets held for sale 1,715  
Long-lived assets held and used $ 1,986