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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Jun. 30, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Capital stock, par value (in dollars per share) $ 2.00 $ 2.00
Capital stock, shares authorized (in shares) 20,000,000 20,000,000
Capital stock, shares issued (in shares) 16,428,388 16,428,388
Treasury stock (in shares) 1,214,440 870,257