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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) - Allowance For Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance, beginning of year $ 3,102 $ 3,746 $ 2,610
Charges to expense 2,369 1,410 3,387
Recoveries (857) (32) (7)
Write-offs and settlements (1,322) (2,167) (1,970)
Foreign exchange and other 12 145 (274)
Balance, end of year $ 3,304 $ 3,102 $ 3,746