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Line of Credit (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Nov. 03, 2014
Dec. 31, 2013
Line of Credit      
Amount outstanding under the facility $ 21,250,000   $ 23,250,000
Facility
     
Line of Credit      
Borrowing capacity 75,000,000    
Maximum effective interest rate (as a percent) 4.75%    
Unused facility fee (as a percent) 0.25%    
Amount outstanding under the facility $ 21,250,000 $ 20,250,000 $ 23,250,000
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) 3.24%