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Net Sales (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Customer Prepayment Current $ 1,000 $ 1,000  
Revenue Recognized in the Current Period From Funds Collected in Advance from Customers in Earlier Periods 1,000 1,000 $ 3,000
Change in Net Sales Related To Adjustments To Rebates Or Business Development Fund Recognized in Revenue in a Prior Period 2,000 1,000 $ 3,000
Customer rebates 23,641 22,682  
Customer Rebates Current $ 1,000 $ 2,000