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Long-Term Debt (Details) - USD ($)	Apr. 01, 2018	Dec. 31, 2017	Sep. 27, 2017	Mar. 23, 2015
Debt Instrument [Line Items]
Capital lease obligations	$ 286,000	$ 378,000
Other long-term debt	1,170,000	1,200,000
Total long-term debt	625,694,000	625,657,000
Senior Notes \| Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term debt	625,000,000	625,000,000
Unamortized premium on 2023 Notes	5,441,000	5,714,000	$ 6,000,000
Debt issuance costs for 2023 Notes	(6,203,000)	$ (6,635,000)	$ (2,100,000)	$ (7,100,000)
Revolving Credit Facility \| ABL Facility 2020
Debt Instrument [Line Items]
Revolving credit facilities	$ 0