EXHIBIT 11 Three Months Ended Nine Months Ended September 30, September 30, ---------------------- ---------------------- 2001 2000 2001 2000 --------- --------- --------- --------- Numerator: Net income $ 79,126 $ 71,037 $ 134,489 $ 201,579 --------- --------- --------- --------- Numerator for basic earnings per share -- income available to common stockholders 79,126 71,037 134,489 201,579 Effect of dilutive securities: Elimination of interest and amortization on 3.25% Convertible Subordinated Debentures due 2003, less the related effect of the provision of income taxes -- (1) -- (1) -- (1) -- (1) --------- --------- --------- --------- Numerator for diluted earnings per share -- income available to common stockholders after assumed conversion $ 79,126 $ 71,037 $ 134,489 $ 201,579 ========= ========= ========= ========= Denominator: Denominator for basic earnings per share -- weighted-average shares 390,455 385,615 389,135 385,960 Effect of dilutive securities: Net effect of dilutive stock options 9,869 3,668 9,192 4,672 Restricted shares issued 750 750 750 750 Assumed conversion of 3.25% Convertible Subordinated Debentures due 2003 -- (1) -- (1) -- (1) -- (1) --------- --------- --------- --------- Dilutive potential common shares 10,619 4,418 9,942 5,422 --------- --------- --------- --------- Denominator of diluted earnings per share -- adjusted weighted-average shares and assumed conversions 401,074 390,033 399,077 391,382 ========= ========= ========= ========= Basic earnings per share $ 0.20 $ 0.18 $ 0.35 $ 0.52 ========= ========= ========= ========= Diluted earnings per share $ 0.20 $ 0.18 $ 0.34 $ 0.52 ========= ========= ========= ========= (1) The effect of these securities was antidilutive for all periods presented.