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Long-Term Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Long-Term Debt    
Amount outstanding under the credit facility $ 2,800,000 $ 10,760,000
Line of Credit    
Long-Term Debt    
Maximum borrowing capacity under the credit facility 35,000,000  
Amount outstanding under the credit facility $ 2,800,000  
Interest rate at the end of the period (as a percent) 1.69%  
Reference rate LIBOR  
Interest rate added to the reference rate (as a percent) (1.50%)  
Remaining maximum borrowings available pursuant to the credit facility $ 13,898,000  
Line of Credit | Minimum    
Long-Term Debt    
Interest rate added to the reference rate (as a percent) 1.25%  
Interest rate added to the reference rate, if the entity entered into the negative pledge (as a percent) 1.50%  
Line of Credit | Maximum    
Long-Term Debt    
Interest rate added to the reference rate (as a percent) 1.75%  
Interest rate added to the reference rate, if the entity entered into the negative pledge (as a percent) 2.00%