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Debt (Details) - USD ($)
$ in Thousands
Mar. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 9,123 $ 9,119
Total long-term debt 224,098 225,500
Total Senior Credit Facilities 233,221 234,619
Term Loan    
Debt Instrument [Line Items]    
Current portion of long-term debt, Gross 9,200 9,200
Long-term debt, Gross 76,825 79,125
Term Loan And Revolving Credit Facility    
Debt Instrument [Line Items]    
Less: unamortized debt issuance costs (77) (81)
Less: unamortized debt issuance costs (2,851) (3,078)
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, Gross $ 150,124 $ 149,453