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Long-term Debt - Debt Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jan. 19, 2017
Debt Instrument [Line Items]
Long-term debt	$ 2,589,732	$ 2,453,388
Less: Current maturities of long-term debt	(62,505)	(62,140)
Less: Debt discount	(2,568)	(2,748)
Less: Debt issuance costs	(35,046)	(38,412)
Long-term debt, net of current maturities and debt issuance costs	$ 2,489,613	2,350,088
Interest rate	5.625%
Secured credit facility \| Revolving Credit Facility due 2023
Debt Instrument [Line Items]
Long-term debt	$ 280,000	112,000
Secured credit facility \| Term Loan A Facility due 2023
Debt Instrument [Line Items]
Long-term debt	689,982	707,674
Secured credit facility \| Term Loan B-1 Facility due 2025
Debt Instrument [Line Items]
Long-term debt	1,123,106	1,128,750
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	$ 96,644	104,583
Capital leases
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 381