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Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accrued Liabilities [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | $ 1,990 | $ 3,110
Vacation | 8,946 | 8,575
Payrolls, related taxes and medical and other benefits | 6,600 | 6,034
Incentive compensation | 6,979 | 7,958
Workers’ compensation and disabilities | 4,048 | 3,746
Accrued Utilities, Current | 2,420 | 2,177
Accrued Customer Rebates | 1,476 | 1,929
Other | 4,588 | 5,982
Total | 42,495 | 42,433
Accrued Severance Liability | 637 | 783
Accrued Freight | 2,091 | 1,581
Derivative Assets (Liabilities), at Fair Value, Net | $ 2,720 | $ 558

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