Long-Term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2019	Jun. 24, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,183,125	$ 1,710,000	$ 1,685,000
Current maturities of long-term debt	(7,500)	(1,875)	(5,625)
Long-term debt, excluding current maturities, gross	2,175,625	1,708,125	1,679,375
Deferred finance costs	(27,750)	(23,793)	(21,807)
Total long-term debt	$ 2,147,875	1,684,332	1,657,568
2024 U.S. fixed rate notes at 5.375%[Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%
Long-term debt, gross	$ 450,000	450,000	450,000
2027 Senior Notes at 5.375% [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.375%
Long-term debt, gross	$ 500,000	500,000	500,000
2029 Notes at 5.250% [Member]
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Long-term debt, gross	$ 500,000	$ 0	$ 0
Senior Secured Term Loan [Member] \| 2017 Credit Agreement [Member]
Debt Instrument [Line Items]
Interest rate during period	4.24%	3.71%	3.83%
Long-term debt, gross	$ 733,125	$ 735,000	$ 735,000
Revolving Credit Facility [Member] \| Revolving Credit Facility Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 25,000	$ 0

Long-term Debt, Excluding Current Maturities, Gross

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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