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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
CURRENT ASSETS:    
Accounts receivable, allowances for discounts and expected credit losses $ 5,900 $ 6,170
Property, plant and equipment, accumulated depreciation $ 234,062 $ 227,788
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 2 $ 2
Common stock, shares authorized (in shares) 30,000,000 30,000,000
Common stock, shares issued (in shares) 23,936,036 23,936,036
Treasury stock - at cost (in shares) 2,366,339 1,911,792