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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 2.00 $ 2
Common stock, shares authorized (in shares) 20,000,000 20,000,000
Common stock, shares issued (in shares) 16,428,388 16,428,388
Treasury stock (in shares) 879,785 905,201