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Long-Term Debt - Long-Term Debt (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Aug. 17, 2015
Long-term Debt      
Unamortized discount $ (1,988,000) $ (1,770,000)  
Unamortized deferred financing costs (3,804,000) (2,952,000)  
Total long-term debt 336,708,000 307,778,000  
Less current maturities of long-term debt (8,027,000)    
Long-term debt, net of current maturities $ 328,681,000 307,778,000  
Revolving Credit Facility      
Long-term Debt      
Long-term debt     $ 40,000
First Lien Credit Facility      
Long-term Debt      
Interest rate (as a percent) 5.50%    
Long-term debt $ 312,500,000 $ 312,500,000 $ 435,000
Senior Term Loan      
Long-term Debt      
Interest rate (as a percent) 9.50%    
Long-term debt $ 30,000,000