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Revenues - Activities and Ending Reserve Balances for Significant Categories of Discounts and Allowances (Details)
$ in Thousands
 9 Months Ended
Sep. 27, 2019
USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 $ 17,276
Provision related to sales made in:  
Current period 139,381
Prior periods (321)
Payments and customer credits issued (136,910)
Balance at September 30, 2019 19,426
Chargebacks and Discounts for Prompt Payment  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 2,322
Provision related to sales made in:  
Current period 92,769
Prior periods (130)
Payments and customer credits issued (92,317)
Balance at September 30, 2019 2,644
Other Customer Credits/Fees and Co-pay Assistance  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 3,038
Provision related to sales made in:  
Current period 11,190
Prior periods (106)
Payments and customer credits issued (11,466)
Balance at September 30, 2019 2,656
Rebates  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance at December 31, 2018 11,916
Provision related to sales made in:  
Current period 35,422
Prior periods (85)
Payments and customer credits issued (33,127)
Balance at September 30, 2019 $ 14,126