Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets (unaudited) (Parenthetical)
Preferred stock, par value (in dollars per share)	$ 25	$ 25
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0667	$ 0.0667
Common stock, shares authorized (in shares)	120,000,000	60,000,000
Common stock, shares issued (in shares)	28,936,712	28,752,325
Common stock, shares outstanding (in shares)	28,936,712	28,752,325