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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, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $3,036 in 2019 and $2,937 in 2018 $ 107,558 $ 124,727  
Accounts and other receivables, allowance for doubtful accounts and sales returns 3,036 2,937  
Customer receivables 110,594 127,664  
Allowance For Doubtful Accounts      
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance, beginning of year 2,937 3,304 $ 3,102
Charges to expense 1,188 553 2,369
Recoveries (38) (56) (857)
Write-offs and settlements (974) (710) (1,322)
Foreign exchange and other (77) (154) 12
Balance, end of year $ 3,036 $ 2,937 $ 3,304