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Line of Credit (Details) (Facility, USD $)
 1 Months Ended 9 Months Ended
Jul. 31, 2012
Sep. 30, 2012
Oct. 31, 2012
Line of Credit      
Interest rate floor (as a percent) 5.50% 4.75%  
Borrowing capacity $ 55,000,000 $ 75,000,000  
Period of extension of maturity date 2 years    
Commitment and extension fees 800,000    
Interest rate (as a percent)   4.75%  
Unused facility fee (as a percent)   0.25%  
Amount outstanding under the facility   $ 6,350,000 $ 2,850,000
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)   3.36%