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Debt - Long-term debt schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Nov. 10, 2017	Apr. 30, 2014
Debt Instrument
Long-term Debt, Gross	$ 946,000	$ 950,000
Unamortized discount and debt issuance costs	9,516	11,137
Total long-term debt	936,484	938,863
Less current maturities of long-term debt	4,000	4,000
Long-term debt less current maturities	932,484	934,863
Senior secured term loan facility due 2021
Debt Instrument
Long-term Debt, Gross				$ 460,000
Senior secured term loan facility due 2025
Debt Instrument
Long-term Debt, Gross	396,000	400,000
Unamortized discount and debt issuance costs	5,100
Senior unsecured notes due 2026
Debt Instrument
Long-term Debt, Gross	$ 550,000	$ 550,000	$ 550,000