Consoidated Balance Sheet (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Stockholders' Equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	500,273,356	485,904,100
Common stock, shares outstanding	449,602,339	436,774,177
Treasury stock, shares	50,671,017	49,129,923