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Revenue Recognition (Analysis of the Chargeback Provision) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Beginning balance $ 20,380 $ 21,644 $ 21,644
Provision for chargebacks and rebates 151,174 110,763  
Credits and payments issued to third parties (154,143) (113,576)  
Ending balance 17,411 $ 18,831 20,380
Accounts Receivable, Net      
Provision for chargebacks and rebates 13,500   16,400
Accounts Payable and Accrued Liabilities      
Provision for chargebacks and rebates $ 3,900   $ 4,000