CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Shareholders' equity:
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	35,383,999	32,317,467
Treasury stock, shares, at cost (in shares)	1,815,648	1,824,336