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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
CURRENT ASSETS:    
Accounts receivable, allowances for discounts and doubtful accounts $ 5,647 $ 5,212
Property, plant and equipment, accumulated depreciation $ 200,960 $ 199,476
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 2.00 $ 2.00
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) 1,622,842 1,477,594