Net Income per Common Share

9 Months Ended

Sep. 30, 2011

Net Income per Common Share

Net Income per Common Share

NOTE B—Net Income per Common Share

        The following tables reconcile income (numerator) and shares (denominator) used in the computations of net income per common share (in thousands, except per share data):

		Three Months Ended September 30,				Nine Months Ended September 30,
		2010		2011		2010		2011
Numerator:
Net income		$	44,784	$	31,355	$	105,731	$	99,884
Denominator:
Weighted average number of common shares outstanding—basic			33,450		29,900		33,715		31,406
	Common stock equivalents—stock options		475		446		389		487
	Common stock equivalents—warrants		157		—		150		—
	Common stock equivalents—restricted stock		6		4		13		10
	Common stock equivalents—restricted stock units		83		88		78		85
	Common stock equivalents—employee stock purchase plan		—		—		—		—
Weighted average number of common shares outstanding—diluted			34,171		30,438		34,345		31,988
Net income per common share—basic		$	1.34	$	1.05	$	3.14	$	3.18
Net income per common share—diluted		$	1.31	$	1.03	$	3.08	$	3.12

        The weighted average number of common shares outstanding for the three and nine months ended September 30, 2010 and 2011 were calculated using outstanding shares of the Company's Ordinary Common Stock. Common stock equivalents included in the calculation of diluted weighted average common shares outstanding for the three and nine months ended September 30, 2010 and 2011 represent stock options to purchase shares of the Company's Ordinary Common Stock, restricted stock awards and restricted stock units, stock to be purchased under the Employee Stock Purchase Plan and shares of Ordinary Common Stock related to certain warrants issued on January 5, 2004.

        The Company had additional potential dilutive securities outstanding representing 1.2 million and 1.9 million options, respectively, for the three and nine months ended September 30, 2010, and 1.1 million and 0.9 million options for the three and nine months ended September 30, 2011, respectively, that were not included in the computation of dilutive securities because they were anti-dilutive for the period. Had these shares not been anti-dilutive, all of these shares would not have been included in the net income per common share calculation as the Company uses the treasury stock method of calculating diluted shares.