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Long-Term Debt - Credit Agreement (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 28, 2019
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Principal amount   $ 414,535  
Term Loan Maturing December 2021      
Debt Instrument [Line Items]      
Principal amount   $ 30,625 $ 33,250
Interest rate (as a percent)   3.40%  
Frequency of periodic payment   quarterly  
Periodic principal payment (as a percent)   2.50%  
Term Loan Maturing December 2021 | Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   2.25%  
Term Loan Maturing December 2021 | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   3.25%  
Revolving Credit Facility Maturing December 2021      
Debt Instrument [Line Items]      
Borrowing capacity   $ 175,000  
Additional commitments (up to)   100,000  
Available borrowing capacity   144,700  
Letters of credit issued   $ 3,400  
Commitment fee percentage   0.50%  
Revolving Credit Facility Maturing December 2021 | Base Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   1.50%  
Revolving Credit Facility Maturing December 2021 | Base Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   2.50%  
Revolving Credit Facility Maturing December 2021 | LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   2.50%  
Revolving Credit Facility Maturing December 2021 | LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   3.50%  
Letter of Credit      
Debt Instrument [Line Items]      
Borrowing capacity   $ 25,000  
Credit Agreement      
Debt Instrument [Line Items]      
Maturity date Dec. 31, 2021    
Credit Agreement | Collateral Pledged      
Debt Instrument [Line Items]      
Maximum percent of shares of foreign subsidiaries   66.00%