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Long-Term Debt and Credit Facility - Additional Disclosures (Details) - USD ($)
 6 Months Ended
Sep. 30, 2016
Jun. 30, 2017
May 22, 2017
Dec. 31, 2016
May 10, 2013
Line of Credit Facility [Line Items]          
Amount borrowed   $ 42,716,000   $ 48,399,000  
Term loan          
Line of Credit Facility [Line Items]          
Amount borrowed   0   $ 9,833,000  
Credit Facility          
Line of Credit Facility [Line Items]          
Limit on capital expenditures   $ 20,000,000      
Covenant, percent of adjusted EBITDA which must be prepaid   25.00%      
Credit facility ceiling value applicable to 25% of adjusting EBITDA which must be paid   $ 3,000,000.0      
Covenant, maximum number of days from year end by which prepayment of 25% of adjusted EBITDA is due   60 days      
Credit Facility | Line of Credit          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity         $ 65,000,000
Credit Facility | Line of Credit | Borrowings under revolving credit facility          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity         55,000,000
Credit facility, availability   $ 64,900,000      
Credit facility, available borrowing capacity, net of outstanding borrowings   $ 22,200,000      
Credit facility, commitment fee percentage   0.25%      
Credit facility, amount outstanding   $ 42,700,000      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | PNC Bank Base Rate          
Line of Credit Facility [Line Items]          
Base lending rate   4.25%      
Credit facility, amount outstanding   $ 7,700,000      
Credit facility, interest rate at period end   5.75%      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | LIBOR          
Line of Credit Facility [Line Items]          
Credit facility, amount outstanding   $ 35,000,000      
Credit facility, interest rate at period end   3.73%      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum          
Line of Credit Facility [Line Items]          
Fixed coverage charge ratio requirement   1.00      
Leverage ratio requirement   4.0      
Undrawn availability required   $ 10,000,000      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum | PNC Bank Base Rate          
Line of Credit Facility [Line Items]          
Credit facility, variable percentage rate spread   1.50%      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Minimum | LIBOR          
Line of Credit Facility [Line Items]          
Credit facility, variable percentage rate spread   2.50%      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum          
Line of Credit Facility [Line Items]          
Fixed coverage charge ratio requirement   1.10      
Leverage ratio requirement   5.5      
Undrawn availability required   $ 15,000,000      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum | PNC Bank Base Rate          
Line of Credit Facility [Line Items]          
Credit facility, variable percentage rate spread   2.00%      
Credit Facility | Line of Credit | Borrowings under revolving credit facility | Maximum | LIBOR          
Line of Credit Facility [Line Items]          
Credit facility, variable percentage rate spread   3.00%      
Credit Facility | Term loan          
Line of Credit Facility [Line Items]          
Debt, face amount $ 10,000,000       10,000,000
Monthly principal payments $ 200,000        
Credit Facility | Letter of Credit | Borrowings under revolving credit facility          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     $ 65,000,000   $ 10,000,000