CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	150,000,000	60,000,000
Common stock, shares issued (in shares)	32,290,481	32,132,817
Treasury stock, shares, at cost (in shares)	1,824,336	1,828,336