Exhibit 11 COMPUTATION OF EARNINGS PER COMMON SHARE (UNAUDITED) (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) THREE MONTHS ENDED NINE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, 1999 2000 1999 2000 ---- ---- ---- ---- BASIC EARNINGS Income before the cumulative effect or a change in accounting principles and extraodinary items .......... $ 1,393 $15,653 $ 29,173 $ 50,807 Cumulative effect of a change in in accounting principles ................................. -- -- (5,315) -- ------- ------- -------- -------- Income before extraordinary items ........................ 1,393 15,653 23,858 50,807 Extraordinary items ....................................... -- -- -- (302) ------- ------- -------- -------- Net earnings ........................................... $ 1,393 $15,653 $ 23,858 $ 50,505 ======= ======= ======== ======== Shares: Weighted average number of common shares outstanding ..................................... 51,059 44,886 51,568 45,982 ======= ======= ======== ======== Basic earnings per common share: Income before the cumulative effect or a change in accounting principles and extraodinary items ........ $ 0.03 $ 0.35 $ 0.56 $ 1.10 Cumulative effect of a change in accounting principles .................................. -- -- (0.10) -- Extraordinary items ...................................... -- -- -- -- ------- ------- -------- -------- Net earnings ........................................... $ 0.03 $ 0.35 $ 0.46 $ 1.10 ======= ======= ======== ======== DILUTED EARNINGS Income before the cumulative effect or a change in accounting principles and extraodinary items .......... $ 1,393 $15,653 $ 29,173 $ 50,807 Cumulative effect of a change in accounting principles .................................... -- -- (5,315) -- ------- ------- -------- -------- Income before extraordinary items ......................... 1,393 15,653 23,858 50,807 Extraordinary items ....................................... -- -- -- (302) ------- ------- -------- -------- Net earnings as adjusted ............................... $ 1,393 $15,653 $ 23,858 $ 50,505 ======= ======= ======== ======== Shares: Weighted average number of common shares outstanding ..................................... 51,059 44,886 51,568 45,982 Options issued ........................................... 1,030 958 1,209 769 ------- ------- -------- -------- Weighted average number of common shares outstanding as adjusted ......................... 52,089 45,844 52,777 46,751 ======= ======= ======== ======== Diluted earnings per common share: Income before the cumulative effect of a change in accounting principles ............................... $ 0.03 $ 0.34 $ 0.55 $ 1.08 Cumulative effect of a change in accounting principles .................................. -- -- (0.10) -- Extraordinary items ...................................... -- -- -- -- ------- ------- -------- -------- Net earnings ........................................... $ 0.03 $ 0.34 $ 0.45 $ 1.08 ======= ======= ======== ========