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Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accrued Liabilities [Abstract] |  |
Accrued Environmental Loss Contingencies, Current | $ 2,100 | $ 1,713
Vacation | 8,254 | 7,155
Payrolls, related taxes and medical and other benefits | 5,519 | 4,762
Incentive compensation | 5,530 | 3,883
Workers’ compensation and disabilities | 3,732 | 3,036
Accrued Utilities, Current | 2,126 | 2,048
Accrued Customer Rebates | 842 | 2,032
Other | 6,956 | 4,252
Total | 38,647 | 33,653
Accrued Severance Liability | 1,976 | 1,908
Accrued Freight | 1,612 | 1,111
Derivative Assets (Liabilities), at Fair Value, Net | $ 0 | $ 1,753

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