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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 25,413,000 25,413,000
Common stock, shares outstanding (in shares) 16,276,000 17,418,000
Treasury stock, shares (in shares) 9,137,000 7,995,000