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Fair Value of Assets and Liabilities (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2014
property
item
Dec. 31, 2013
Assets and liabilities measured at fair value      
Number of properties classified as held for sale   13  
Cumulative impairments of properties held for sale   $ 41,911  
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    
Number of public issues of unsecured senior notes   4  
Senior notes   1,093,658 1,093,337
Excess of fair value over aggregate book value   36,685  
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   25,644  
Long-lived assets held and used   653  
Investments in available for sale securities   27,157  
Unsecured senior notes   1,130,343  
Secured debt   753,953  
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   27,157  
Unsecured senior notes   1,130,343  
Recurring and Nonrecurring | Significant Other Observable Inputs (Level 2)
     
Assets and liabilities measured at fair value      
Assets held for sale   25,644  
Long-lived assets held and used   653  
Recurring and Nonrecurring | Significant Unobservable Inputs (Level 3)
     
Assets and liabilities measured at fair value      
Secured debt   $ 753,953