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Long-Term Debt - Term Loans (Details)
$ in Thousands
1 Months Ended 6 Months Ended 9 Months Ended
Sep. 28, 2019
USD ($)
Jun. 29, 2019
AUD ($)
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument          
Proceeds from long term debt     $ 25,068 $ 151,102  
Unamortized debt issuance costs $ 11,189   $ 11,189   $ 11,417
Australian Facility | Secured Debt          
Debt Instrument          
Borrowing availability   $ 5,000,000.0      
Term Loan | Term Loan          
Debt Instrument          
Proceeds from long term debt 125,000        
Repayment of long term debt $ 115,000        
Debt instrument discount rate (percent) 0.50%   0.50%    
Debt instrument discount rate $ 600   $ 600    
Unamortized debt issuance costs 600   600    
Long term debt principal amount outstanding 557,800   557,800    
Long-term debt 592,794   592,794   $ 474,058
Term Loan | Australian Facility | Secured Debt          
Debt Instrument          
Increase in borrowing capacity   $ 50,000,000.0      
Unused commitment fee (percent)   1.25%      
Long-term debt $ 33,800   $ 33,800    
Term Loan | Australian Facility | Secured Debt | BBSY | Minimum          
Debt Instrument          
Debt instrument, variable rate (percent)   1.00%      
Term Loan | Australian Facility | Secured Debt | BBSY | Maximum          
Debt Instrument          
Debt instrument, variable rate (percent)   1.10%