CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par value (in usd per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	25,413,000	25,413,000
Common stock, shares issued (in shares)	25,413,000	25,413,000
Common stock, shares outstanding (in shares)	18,350,000	19,021,000
Treasury stock, shares (in shares)	7,063,000	6,392,000