Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total	$ 785,236	$ 836,500
Less: unamortized loan fees	14,994	14,542
Total debt, net of unamortized loan fees	770,242	821,958
Current maturities of long-term debt, net of current unamortized loan fees	20,618	64,397
Long-term debt, less current maturities, net of unamortized loan fees	749,624	757,561
Term loan A-1
Debt Instrument [Line Items]
Total	287,699	436,500
Term loan A-2
Debt Instrument [Line Items]
Total	$ 497,537	$ 400,000