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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
CommonWealth REIT (CWH)
   
Investment in available for sale securities    
Investment in common shares 250,000  
Percentage of common shares owned 0.30%  
Weighted average quoted market prices (in dollars per share) $ 15.84 $ 26.00
Fair value of the investments in available for sale securities $ 3,960 $ 4,160
Unrealized loss 2,540 2,340
Five Star
   
Investment in available for sale securities    
Investment in common shares 4,235,000  
Weighted average quoted market prices (in dollars per share) $ 5.01 $ 3.36
Fair value of the investments in available for sale securities 21,217 12,705
Unrealized gain $ 7,003 $ (1,509)