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Accounts And Other Receivables (Schedule Of Accounts And Other Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts and Financing Receivable, after Allowance for Credit Loss [Abstract]    
Accounts Receivable, before Allowance for Credit Loss, Current $ 106,153 $ 122,182
Customer receivables 110,594 127,664
Other accounts and notes receivable 4,441 5,482
Total accounts and other receivables 107,558 124,727
Allowance for Doubtful Accounts and Sales Returns $ 3,036 $ 2,937