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Fair Value of Assets and Liabilities (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
item
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 741,412 965,770
Excess of fair value over book value 82,068  
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 and Nonrecurring | Total
    
Assets and liabilities measured at fair value    
Assets held for sale 1,715  
Long-lived assets held and used 1,982  
Investments in available for sale securities 17,781  
Unsecured senior notes 823,480  
Recurring and Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Assets and liabilities measured at fair value    
Investments in available for sale securities 17,781  
Unsecured senior notes 823,480  
Recurring and Nonrecurring | 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 $ 1,982