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Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accrued Liabilities [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | $ 2,122 | $ 1,990
Vacation | 8,842 | 8,946
Payrolls, related taxes and medical and other benefits | 6,823 | 6,600
Incentive compensation | 9,792 | 6,979
Workers’ compensation and disabilities | 3,557 | 4,048
Accrued Utilities, Current | 2,588 | 2,420
Accrued Customer Rebates | 2,442 | 1,476
Other | 4,519 | 4,588
Total | 45,809 | 42,495
Accrued Severance Liability | 1,389 | 637
Accrued Freight | 1,547 | 2,091
Derivative Assets (Liabilities), at Fair Value, Net | $ 2,188 | $ 2,720

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