CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, issued
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	349,000,000	349,000,000
Common stock, shares issued	147,458,440	148,175,995
Common stock, shares outstanding	147,458,440	148,175,995