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Accounts And Other Receivables (Schedule Of Reconciliation Of The Beginning And Ending Balances Of The Allowance For Doubtful Accounts And Sales Returns) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Customer receivables $ 105,048 $ 89,124  
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Reclassification to accrued expenses for estimated sales returns (775) 0 $ 0
Allowance For Doubtful Accounts      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance, beginning of year 2,797 1,904 2,054
Charges to expense 1,440 1,901 715
Recoveries 35 (90) (38)
Write-offs and settlements (1,246) (709) (756)
Foreign exchange and other (515) (209) (71)
Balance, end of year $ 1,736 $ 2,797 $ 1,904