Indebtedness and Interest Expense - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 982,700		$ 982,700		$ 986,500
Unamortized original issue discount	(1,424)		(1,424)		(1,694)
Debt Issuance Costs, Noncurrent, Net	(10,433)		(10,433)		(11,993)
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months	(7,600)		(7,600)		(7,600)
Bank indebtedness and other long-term debt, net of deferred financing costs, less current portion	963,243		963,243		965,213
Interest Expense, Other Long-term Debt	(341)	$ (281)	(640)	$ (596)
Interest Expense	19,113	17,061	37,671	34,123
Term Loan Facility [Member]
Debt Instrument [Line Items]
Interest Expense, Debt	9,681	7,619	18,800	15,226
Long-term debt, gross	727,700		727,700		731,500
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	255,000		255,000		$ 255,000
Interest Expense, Debt, Excluding Amortization	5,083	5,083	10,165	10,165
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases, Income Statement, Interest Expense	431	414	859	831
InterestExpenseSaleLeaseback	2,623	2,663	5,252	5,302
Sale Leaseback Obligations [Member]
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 954	$ 1,001	$ 1,955	$ 2,003
Senior Notes due 2022 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	8.00%		8.00%

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Amount of amortization expense attributable to debt issuance costs.

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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.

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

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

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