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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 740,570 $ 785,236
Less: unamortized loan fees 12,558 14,994
Total debt, net of unamortized loan fees 728,012 770,242
Current maturities of long-term debt, net of current unamortized loan fees 31,634 20,618
Long-term debt, less current maturities, net of unamortized loan fees 696,378 749,624
Term loan A-1    
Debt Instrument [Line Items]    
Long-term debt 265,855 287,699
Term loan A-2    
Debt Instrument [Line Items]    
Long-term debt $ 474,715 $ 497,537