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Debt - Long-term debt schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Nov. 10, 2017	Apr. 30, 2014
Debt Instrument
Long-term Debt, Gross	$ 950,000	$ 683,850
Unamortized discount and debt issuance costs	11,137	9,470
Total long-term debt	938,863	674,380
Less current maturities of long-term debt	4,000	100,000
Long-term debt less current maturities	934,863	574,380
Senior secured term loan facility due 2021
Debt Instrument
Long-term Debt, Gross	0	133,850		$ 460,000
Senior secured term loan facility due 2025
Debt Instrument
Long-term Debt, Gross	400,000	0
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