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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