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Long-term Debt, Line of Credit and Derivatives - Provisions of Term Loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 27, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Additional principal paydown $ 18,200    
Line of Credit      
Debt Instrument [Line Items]      
Outstanding principal balance   $ 73,290 $ 80,500
Term Loan      
Debt Instrument [Line Items]      
Current portion of debt   3,800  
Quarterly principal payments   3,000  
Additional principal paydown   18,200  
Non-current portion of debt   $ 33,500  
Term Loan | LIBOR      
Debt Instrument [Line Items]      
Effective interest rate   4.50%  
Term Loan | Line of Credit      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity     $ 60,000
Fair value of amount outstanding   $ 37,300  
Outstanding principal balance   $ 37,290