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Long-Term Debt and Credit Facility - Credit Facility (Details) (USD $)
 0 Months Ended 6 Months Ended 12 Months Ended
Mar. 03, 2014
Jun. 30, 2014
Dec. 31, 2013
Line of Credit Facility [Line Items]      
Credit facility, financial covenant, EBITDA to debt ratio, upper range   1.10  
Credit facility, financial covenant, funded debt to adjusted EBITDA ratio   4.0  
Covenant, Percent of Adjusted EBITDA Which Must Be Prepaid   25.00%  
Credit Facility Ceiling Value, Applicable to 25% Of Adjusted EBITDA Which Must Be Paid   $ 3,000,000  
Covenant, Maximum Number of Days From Year End By Which Prepayment of 25% of Adjusted EBTDA is Due   60 days  
Excess Cash Flow Minimum Achieved Under Loan Covenant     3,000,000
Amount paid on term loan due to covenant requirement 3,000,000    
Amount borrowed   56,909,000 62,105,000
Line of Credit [Member]
      
Line of Credit Facility [Line Items]      
Annual limit on capital expenditures   36,000,000  
Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   75,000,000.0  
Credit facility, commitment fee percentage   0.25%  
Credit facility, availability   74,800,000  
Credit facility, available borrowing capacity, net of outstanding borrowings   57,000,000  
Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Amount borrowed   17,796,000 16,272,000
Letter of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   10,000,000  
Term loan [Member]
      
Line of Credit Facility [Line Items]      
Debt, face amount   50,000,000.0  
Amount borrowed   39,113,000 45,833,000
Monthly principal payments   600,000  
PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, amount outstanding   1,800,000  
Credit facility, interest rate at period end   3.75%  
PNC Bank Base Rate [Member] | Term loan [Member]
      
Line of Credit Facility [Line Items]      
Debt, interest rate at period end   4.50%  
Amount borrowed   100,000  
London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Base lending rate   3.25%  
Credit facility, amount outstanding   16,000,000  
Credit facility, interest rate at period end   1.65%  
London Interbank Lending Rate (LIBOR) [Member] | Term loan [Member]
      
Line of Credit Facility [Line Items]      
Debt, interest rate at period end   2.41%  
Amount borrowed   $ 39,000,000  
Minimum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   0.50%  
Minimum [Member] | PNC Bank Base Rate [Member] | Term loan [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   1.25%  
Minimum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   1.50%  
Minimum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Term loan [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   2.25%  
Maximum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   1.00%  
Maximum [Member] | PNC Bank Base Rate [Member] | Term loan [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   1.75%  
Maximum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   2.00%  
Maximum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Term loan [Member]
      
Line of Credit Facility [Line Items]      
Credit facility, variable percentage rate spread   2.75%