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Unrealized Gain on Investments (Details) (USD $)
In Thousands, except Share data
 1 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
CommonWealth REIT (CWH)
    
Unrealized gain on investments    
Investment in common shares (in shares) 250,000 250,000
Quoted market prices (in dollars per share) $ 25.84 $ 25.84
Weighted average costs (in dollars per share)   $ 26.00
Five Star
    
Unrealized gain on investments    
Shares of common stock acquired in public offering (in shares) 1,000,000  
Shares of common stock to be issued under public offering (in shares) 11,500,000  
Aggregate purchase price of shares of common stock acquired in public offering $ 5,000  
Investment in common shares (in shares) 4,235,000 4,235,000
Quoted market prices (in dollars per share) $ 5.81 $ 5.81
Weighted average costs (in dollars per share)   $ 3.36