Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Basic And Diluted Weighted Average Shares Outstanding

Year Ended December 31	2009		2010		2011
Basic weighted average shares outstanding		385,475		381,240		364,147
Dilutive effect of stock options and restricted stock*		2,448		3,996		3,377
Diluted weighted average shares outstanding		387,923		385,236		367,524

* Excludes the following outstanding options to purchase shares of common stock and nonvested restricted stock because the effect of including these options and restricted shares would be antidilutive: 2009 - 14,986; 2010 - 17,867; 2011 - 23,079.