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Long-term Debt (Details) (USD $)
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Long-term Debt    
Long-term debt $ 50,853,000 $ 51,233,000
Less current maturities 126,000 243,000
Long-term debt, excluding current maturities 50,727,000 50,990,000
Installment loans, due 2014-2020
   
Long-term Debt    
Long-term debt 853,000 1,233,000
Weighted-average interest rate (as a percent) 10.46% 10.54%
Revolver
   
Long-term Debt    
Long-term debt 50,000,000 50,000,000
Weighted-average interest rate (as a percent) 3.96% 3.96%
Revolving credit facility, maximum borrowing capacity 200,000,000  
Revolving credit facility contingent increase in maximum borrowing capacity 200,000,000  
Revolving credit facility maximum borrowing capacity after contingent increase 400,000,000  
Revolving credit facility, amount outstanding 50,000,000  
Revolving credit facility, remaining borrowing capacity 144,600,000  
Letters of credit outstanding $ 5,400,000  
Revolving credit facility, fixed charge coverage ratio 2.00  
Revolving credit facility, leverage ratio 3.00  
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth 15.00%  
Revolver | Minimum
   
Long-term Debt    
Percentage of commitment fee on unused credit facility 0.125%  
Revolver | Maximum
   
Long-term Debt    
Percentage of commitment fee on unused credit facility 0.30%  
Revolver | LIBOR | Minimum
   
Long-term Debt    
Interest rate added to base rate (as a percent) 0.875%  
Revolver | LIBOR | Maximum
   
Long-term Debt    
Interest rate added to base rate (as a percent) 1.875%  
Revolver | Federal Funds
   
Long-term Debt    
Interest rate added to base rate (as a percent) 0.50%  
Revolver | Adjusted Eurodollar Rate
   
Long-term Debt    
Interest rate added to base rate (as a percent) 1.00%