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Loan Receivable (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Five Star
May 31, 2011
Five Star
Jun. 30, 2011
Five Star
Senior living communities
Property
May 31, 2011
Five Star
Senior living communities
Property
Dec. 31, 2011
Five Star
Senior living communities
Property
Loans Receivable                
Amount agreed to be lent under Bridge Loan Agreement         $ 80,000      
Number of properties funded under Bridge Loan             6  
Aggregate purchase price of properties acquired by borrower             122,800  
Number of properties acquired by borrower           6    
Amount borrowed under the Bridge Loan           80,000    
Amount repaid by borrower           42,000    
Amount outstanding under Bridge Loan       38,000        
Number of properties mortgaged, acquired by borrower               3
Number of properties mortgaged, owned by borrower               4
Spread over annual rates of interest applicable to borrowings under revolving credit facility (as a percent)       1.00%        
Interest rate (as a percent)       2.90%        
Interest income recognized $ 1,451 $ 844 $ 935 $ 593