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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, 2013
property
item
building
Dec. 31, 2012
Assets and liabilities measured at fair value    
Investments in available for sale securities $ 29,078 $ 25,177
Number of properties classified as held for sale 14  
Number of buildings classified as held for sale 17  
Cumulative impairments of properties held for sale 44,395  
Number of properties in long-lived assets held and used 1  
Impairment of assets charge related to long-lived assets held and used 1,304 3,071
Number of public issues of unsecured senior notes 4  
Senior notes 1,093,337 1,092,053
Excess of fair value over aggregate book value 6,041  
CommonWealth REIT (CWH)
    
Assets and liabilities measured at fair value    
Investments in available for sale securities 5,828 3,960
Investment in common shares 250,000  
Five Star
    
Assets and liabilities measured at fair value    
Investments in available for sale securities 23,250 21,217
Investment in common shares 4,235,000  
Recurring and Nonrecurring | Total
    
Assets and liabilities measured at fair value    
Assets held for sale 29,219  
Long-lived assets held and used 653  
Investments in available for sale securities 29,078  
Unsecured senior notes 1,099,378  
Secured debt 755,303  
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 29,078  
Unsecured senior notes 1,099,378  
Recurring and Nonrecurring | Significant Other Observable Inputs (Level 2)
    
Assets and liabilities measured at fair value    
Assets held for sale 29,219  
Long-lived assets held and used 653  
Recurring and Nonrecurring | Significant Unobservable Inputs (Level 3)
    
Assets and liabilities measured at fair value    
Secured debt $ 755,303