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Long-Term Debt (Details)
$ in Thousands
12 Months Ended
Feb. 14, 2017
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Long-term debt        
Less: Current portion     $ (2,133)  
Long-term debt less current portion     205,509 $ 210,270
Assets     497,886 530,441
Liabilities     258,982 261,101
Financing costs     1,114  
Deferred financing costs     1,500 1,800
Accumulated amortization     1,800 1,500
Maturities of long-term debt        
2018     2,133  
2019     2,133  
2020     2,133  
2021     2,133  
2022 and thereafter     202,682  
Total maturities     211,214  
Second Amended Term Loan Facility        
Long-term debt        
OID $ 1,100   2,000  
Financing costs     1,400  
Accumulated amortization of original issue discount     1,500  
Deferred financing costs     1,500  
Accumulated amortization     1,800  
Amortization payments (in percentage) 1.00%      
Second Amended Term Loan Facility | LIBOR        
Long-term debt        
Interest rate margin (as a percent) 3.50%      
Interest rate floor (as a percent) 0.00%      
Second Amended Term Loan Facility | Alternate Base Rate (ABR)        
Long-term debt        
Interest rate margin (as a percent) 2.50%      
Senior Notes due February 2024        
Long-term debt        
Long-term Debt     $ 207,642  
Existing Senior Secured Term Loan B Facility        
Long-term debt        
Long-term Debt       $ 210,270
Amount of term loan $ 213,300      
Uncommitted accordion option base amount 65,000      
Uncommitted accordion option multiplier of net leverage ratio | item     2.95  
Borrowing capacity $ 60,000      
Maximum period after each fiscal year for prepayment of debt     90 days  
Prepayment of debt as a percentage of excess cash flow     50.00%  
First prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained     25.00%  
Second prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained     0.00%  
Existing Senior Secured Term Loan B Facility | Adjustment        
Long-term debt        
Payment of excess cash flow   $ 2,100    
Existing Senior Secured Term Loan B Facility | LIBOR        
Long-term debt        
Interest rate margin (as a percent) 4.00%      
Interest rate floor (as a percent) 1.00%      
Existing Senior Secured Term Loan B Facility | Alternate Base Rate (ABR)        
Long-term debt        
Interest rate margin (as a percent) 3.00%      
Amended Term Loan Facility        
Long-term debt        
Borrowing capacity $ 30,000      
Debt caps amount $ 45,000      
Amended Term Loan Facility | First Lien Net Leverage Ratio        
Long-term debt        
Uncommitted accordion option multiplier of net leverage ratio | item 4.00      
Amended Term Loan Facility | Total Net Leverage Ratio        
Long-term debt        
Uncommitted accordion option multiplier of net leverage ratio | item 6.00      
Number of consecutive fiscal quarters | item 4