Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 760,459	$ 785,236
Less: unamortized loan fees	13,453	14,994
Total debt, net of unamortized loan fees	747,006	770,242
Current maturities of long-term debt, net of current unamortized loan fees	27,939	20,618
Long-term debt, less current maturities, net of unamortized loan fees	719,067	749,624
Term loan A-1
Debt Instrument [Line Items]
Long-term debt	274,919	287,699
Term loan A-2
Debt Instrument [Line Items]
Long-term debt	$ 485,540	$ 497,537