Earnings Per Share

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Earnings Per Share

C. EARNINGS PER SHARE

We compute basic earnings per share using net earnings for the period and the weighted average number of common shares outstanding during the period. Diluted earnings per share incorporates the additional shares issuable upon the assumed exercise of stock options and the release of restricted shares. Basic and diluted weighted average shares outstanding were as follows (in thousands):

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.