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Line of Credit (Details) (USD $)
 1 Months Ended 6 Months Ended
Jul. 31, 2012
Jun. 30, 2012
Line of Credit    
Commitment and extension fees $ 800,000  
Facility
    
Line of Credit    
Interest rate floor (as a percent) 4.75% 5.50%
Borrowing capacity 75,000,000 55,000,000
Period of extension of maturity date 2 years  
Interest rate (as a percent) 4.75% 5.50%
Unused facility fee (as a percent)   0.25%
Amount outstanding under the facility $ 15,350,000 $ 19,600,000
Facility | LIBOR
    
Line of Credit    
Basis of interest rate   90 day LIBOR
Spread on variable interest rate (as a percent)   3.00%
Interest rate at end of period (as a percent) 3.44% 3.46%