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Long-Term Debt (Details)
$ in Thousands
12 Months Ended
Feb. 14, 2017
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Long-term debt      
Less: Current portion   $ (2,134) $ (2,134)
Long-term debt less current portion   202,406 203,957
Deferred financing costs   1,000 1,300
Accumulated amortization   2,300 2,000
Loss or gain in fair value   0 0
Maturities of long-term debt      
2020   2,134  
2021   2,134  
2022   2,134  
2023   2,134  
2024   198,411  
Total maturities   $ 206,947  
Second Amended Term Loan Facility      
Long-term debt      
Amount of term loan $ 213,300    
Uncommitted accordion option multiplier of net leverage ratio   2.20  
OID   $ 1,400  
Accumulated amortization of original issue discount   2,100  
Deferred financing costs   1,000  
Accumulated amortization   $ 2,300  
Maximum period after each fiscal year for prepayment of debt   90 days  
First prepayment of debt as a percentage of excess cash flow, if lower leverage ratio is maintained   0.00%  
Amortization payments (in percentage) 1.00%    
Second Amended Term Loan Facility | First Lien and Total Net Leverage Ratio      
Long-term debt      
Debt caps amount $ 60,000    
Second Amended Term Loan Facility | LIBOR      
Long-term debt      
Interest rate margin (as a percent) 3.50%    
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   $ 204,540 $ 206,091
Existing Senior Secured Term Loan B Facility      
Long-term debt      
Uncommitted accordion option base amount $ 65,000    
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%  
Amended Term Loan Facility      
Long-term debt      
Borrowing capacity $ 30,000    
Amended Term Loan Facility | First Lien Net Leverage Ratio      
Long-term debt      
Uncommitted accordion option multiplier of net leverage ratio | item 4.00    
Number of consecutive fiscal quarters | item 4    
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