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Accrued Expenses (Schedule Of Accrued Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accrued Liabilities [Abstract]    
Accrued Environmental Loss Contingencies, Current $ 1,634 $ 2,066
Vacation 3,452 7,283
Payrolls, related taxes and medical and other benefits 6,903 9,571
Incentive compensation 7,016 8,138
Workers’ compensation and disabilities 2,422 2,986
Accrued Utilities, Current 1,938 1,460
Accrued Customer Rebates 1,857 1,398
Other 3,846 4,061
Accrued expenses 33,104 40,741
Accrued Severance Liability 445 1,894
Accrued Freight 2,337 1,397
Derivative Assets (Liabilities), at Fair Value, Net 1,254 $ 487
Vacation accrual policy change 3,900  
Vacation accrual policy change in SG&A 1,300  
Vacation accrual policy change in cost of sales $ 2,600