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Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Accrued Liabilities [Abstract]    
Vacation $ 7,155 $ 7,266
Payrolls, related taxes and medical and other benefits 4,762 4,119
Incentive compensation 3,883 3,803
Workers’ compensation and disabilities 3,036 3,007
Accrued Utilities, Current 2,048 2,186
Accrued Customer Rebates 2,032 2,055
Other 7,076 9,132
Total 33,653 32,049
Accrued Severance Liability 1,908 245
Derivative Assets (Liabilities), at Fair Value, Net $ 1,753 $ 236