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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total debt $ 276,648 $ 214,017
Less: Current maturities of long-term debt 36,648 34,017
Long-term debt 240,000 180,000
Revolving credit facility with interest at a variable rate (2017 - 2.7%; 2016 - 1.8%)    
Debt Instrument [Line Items]    
Total debt $ 267,500 $ 214,000
Effective interest rate 2.70% 1.80%
Other amounts    
Debt Instrument [Line Items]    
Total debt $ 9,148 $ 17