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Revenues - Activities and Ending Reserve Balances for Significant Categories of Discounts and Allowances (Details)
$ in Thousands
 9 Months Ended
Sep. 28, 2018
USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance $ 9,493
Provision related to sales made in:  
Current period 82,696
Prior periods (314)
Payments and customer credits issued (77,208)
Balance 14,667
Chargebacks and Discounts for Prompt Payment  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance 1,928
Provision related to sales made in:  
Current period 52,296
Prior periods (520)
Payments and customer credits issued (50,726)
Balance 2,978
Other Customer Credits/Fees and Co-pay Assistance  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance 1,795
Provision related to sales made in:  
Current period 9,208
Prior periods 156
Payments and customer credits issued (9,412)
Balance 1,747
Rebates  
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance 5,770
Provision related to sales made in:  
Current period 21,192
Prior periods 50
Payments and customer credits issued (17,070)
Balance $ 9,942