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Long-term Debt, Line of Credit and Derivatives - Provisions of Term Loan (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 27, 2019
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Additional principal paydown $ 18,200    
Outstanding principal balance   $ 70,040 $ 80,500
Term Loan | Line of Credit Facility      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 60,000
Fair value of amount outstanding   38,000  
Current portion of debt   3,400  
Periodic payment, principal   2,300  
Additional principal paydown   18,200  
Long-term debt, excluding current maturities   34,600  
Outstanding principal balance   $ 38,040  
Term Loan | Line of Credit Facility | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Interest rate, effective percentage   5.56%