EXHIBIT 11.1 CALCULATION OF NET INCOME PER COMMON SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS) (UNAUDITED) For the three For the nine months ended months ended September 30, September 30, ----------------- ---------------- 1997 1996 1997 1996 -------- ------- ------- ------- Net income......................... $ 3,303 $ 2,838 $11,322 $11,789 Dividends paid on preferred stock.. - - - (1,531) ------- ------- ------- ------- Amount available to common shareholders.................... $ 3,303 $ 2,838 $11,322 $10,258 ======= ======= ======= ======= Weighted average number of common shares outstanding.............. 36,789 32,025 36,632 30,695 ======= ======= ======= ======= Net income per common share........ $ 0.09 $ 0.09 $ 0.31 $ 0.33 ======= ======= ======= ======= CALCULATION OF WEIGHTED AVERAGE COMMON SHARES OUTSTANDING (IN THOUSANDS) (UNAUDITED) For the three For the nine months ended months ended September 30, September 30, ----------------- -------------- 1997 1996 1997 1996 --------- ------ ------ ------ Shares outstanding from beginning of period.................................................. 35,607 28,704 35,217 28,150 158 and 547 stock options exercised in the three and nine months ended September 30, 1997, respectively...... 53 - 306 - 504 and 1,058 stock options and warrants exercised in the three and nine months ended September 30, 1996, respectively............................................ - 210 - 380 Common shares issued in exchange for shares of General Atlantic Resources, Inc................................. 3 - 1 - 1,845 common shares issued in conversion of preferred stock, July 25, 1996.......................... - 1,344 - 451 Common stock equivalents of stock options/(1)/...................................... 1,126 1,767 1,108 1,714 ------ ------ ------ ------ 36,789 32,025 36,632 30,695 ====== ====== ====== ====== /(1)/ The calculation of common stock equivalents of stock options is based on the "Treasury Method" as detailed in Accounting Principles Board Opinion No. 15.