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Accounts And Other Receivables (Schedule Of Accounts And Other Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts and Financing Receivable, after Allowance for Credit Loss [Abstract]    
Accounts Receivable, Gross, Current $ 85,274 $ 88,822
Customer receivables 89,124 91,021
Other accounts and notes receivable 3,850 2,199
Total accounts and other receivables 86,327 89,117
Allowance for Doubtful Accounts and Sales Returns 2,797 1,904
Accounts Receivable, after Allowance for Credit Loss $ 86,327 $ 89,117