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Long-term Debt - Debt Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 19, 2017
Debt Instrument [Line Items]
Long-term debt	$ 2,453,388	$ 1,280,201
Less: Current maturities of long-term debt	(62,140)	(35,612)
Less: Debt discount	(2,748)	(2,558)
Less: Debt issuance costs	(38,412)	(27,406)
Long-term debt, net of current maturities and debt issuance costs	$ 2,350,088	1,214,625
Interest rate	5.625%
Secured credit facility \| Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Long-term debt	$ 112,000	0
Secured credit facility \| Term Loan A Facility due 2023
Debt Instrument [Line Items]
Long-term debt	707,674	288,750
Secured credit facility \| Term Loan B Facility due 2024
Debt Instrument [Line Items]
Long-term debt	0	471,250
Secured credit facility \| Term Loan B-1 Facility due 2025
Debt Instrument [Line Items]
Long-term debt	1,128,750	0
Senior notes \| 5.625% Notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 400,000	400,000
Interest rate	5.625%		5.625%
Other long-term obligations
Debt Instrument [Line Items]
Long-term debt	$ 104,583	119,310
Capital leases
Debt Instrument [Line Items]
Long-term debt	$ 381	$ 891