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Long-Term Debt and Other Long-Term Liabilities - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 20, 2018	Dec. 31, 2017	Sep. 13, 2017	Mar. 29, 2017	Jul. 23, 2015
Long-term debt
Less: Unamortized debt issuance costs	$ (8,292)		$ (8,616)
Capital leases	484		917
Long-term notes payable	2,463		2,531
Less: Current portion	(447)		(615)
Long-term debt, noncurrent	2,967,434		2,189,578
Term Loan
Long-term debt
Long-term debt, gross	956,750		956,750
Less: Unamortized discount and debt issuance costs	(18,840)		(18,748)
Long-term Debt	937,910		938,002
6% Senior Notes due 2026
Long-term debt
Long-term debt, gross	600,000	$ 600,000
Less: Unamortized discount and debt issuance costs	(1,895)
Long-term Debt	598,105
6% Senior Notes due 2025
Long-term debt
Long-term debt, gross	875,000		875,000	$ 500,000	$ 375,000
Plus: Unamortized debt premium	24,285		26,605
Less: Unamortized debt issuance costs	(18,996)		(20,716)
Long-term Debt	880,289		880,889
7% Senior Notes due 2023
Long-term debt
Long-term debt, gross	375,000		375,000			$ 375,000
Less: Unamortized discount and debt issuance costs	(6,370)		(7,146)
Long-term Debt	368,630		$ 367,854
Revolving Credit Facility
Long-term debt
Amount outstanding	$ 180,000