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Debt (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total current portion of long-term debt $ 9,131 $ 9,119
Total long-term debt 247,293 225,500
Total Senior Credit Facilities 256,424 234,619
Term Loan    
Debt Instrument [Line Items]    
Current portion of long-term debt, Gross 9,200 9,200
Long-term debt, Gross 69,925 79,125
Term Loan And Revolving Credit Facility    
Debt Instrument [Line Items]    
Less: unamortized debt issuance costs (69) (81)
Less: unamortized debt issuance costs (2,380) (3,078)
Revolving Credit Facility    
Debt Instrument [Line Items]    
Long-term debt, Gross $ 179,748 $ 149,453