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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Oct. 31, 2011
Jul. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
CommonWealth REIT (CWH)
Y
Dec. 31, 2010
CommonWealth REIT (CWH)
Jun. 30, 2011
Five Star
Dec. 31, 2011
Five Star
Y
Dec. 31, 2010
Five Star
Investment in available for sale securities                
Investment in common shares (in shares)       250,000     4,235,000  
Percentage of common shares owned       0.30%     8.84%  
Additional number of common shares acquired (in shares)           1,000,000    
Common shares issued in public offering (in shares) 9,200,000 11,500,000 14,400,000     11,500,000    
Aggregate purchase price of shares acquired           $ 5,000    
Weighted average quoted market prices (in dollars per share)       $ 16.64 $ 26.00   $ 3.00 $ 3.36
Fair value of the investments in available for sale securities       4,160 6,378   12,705 22,871
Unrealized loss       2,340 122      
Unrealized gain             $ (1,509) $ 13,656
Period during which investments have been in unrealized loss position (in years)       1     1