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Fair Value of Assets and Liabilities (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Assets and liabilities measured at fair value    
Number of properties classified as held for sale 1  
Cumulative impairments of properties held for sale $ 5,738  
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 4  
Senior notes 1,092,053 965,770
Excess of fair value over book value 93,032  
CommonWealth REIT (CWH)
    
Assets and liabilities measured at fair value    
Investments in available for sale securities 3,960 4,160
Investment in common shares 250,000  
Five Star
    
Assets and liabilities measured at fair value    
Investments in available for sale securities 21,217 12,705
Investment in common shares 4,235,000  
Recurring and Nonrecurring | Total
    
Assets and liabilities measured at fair value    
Assets held for sale 850  
Long-lived assets held and used 1,966  
Investments in available for sale securities 25,177  
Unsecured senior notes 1,185,085  
Secured debt 814,591  
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 25,177  
Unsecured senior notes 1,185,085  
Recurring and Nonrecurring | Significant Other Observable Inputs (Level 2)
    
Assets and liabilities measured at fair value    
Assets held for sale 850  
Long-lived assets held and used 1,966  
Recurring and Nonrecurring | Significant Unobservable Inputs (Level 3)
    
Assets and liabilities measured at fair value    
Secured debt $ 814,591