Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,685,588	32,627,244
Common stock, shares outstanding	21,220,481	21,162,137
Treasury stock, shares	11,465,107	11,465,107