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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 1.00 $ 1.00
Common stock, shares authorized 25,413,000 25,413,000
Common stock, shares issued 25,413,000 25,413,000
Common stock, shares outstanding 18,774,000 19,021,000
Treasury stock, shares 6,639,000 6,392,000