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Accounts And Other Receivables (Schedule Of Accounts And Other Receivable) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accounts and Notes Receivable, Net [Abstract]    
Trade, less allowance for doubtful accounts and sales returns of $3,746 in 2015 and $2,610 in 2014 $ 90,028 $ 106,093
Other 4,189 7,248
Total 94,217 113,341
Allowance for Doubtful Accounts and Sales Returns $ 3,746 $ 2,610