A summary of the earnings per share calculation is as follows (in thousands, except per share amounts):



	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Basic earnings per share:
Net income	$	10,599	$	15,587	$	20,453	$	27,901
Weighted average common shares	28,938		27,844		28,784		27,658
Basic earnings per share	$	0.37	$	0.56	$	0.71	$	1.01
Diluted earnings per share (1):
Net income	$	10,599	$	15,587	$	20,453	$	27,901
Weighted average common shares	28,938		27,844		28,784		27,658
Effect of dilutive securities:
Employee stock plans	1,408		1,691		1,487		1,802
Diluted weighted average common shares	30,346		29,535		30,271		29,460
Diluted earnings per share	$	0.35	$	0.53	$	0.68	$	0.95

_______________

(1)

The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share when they become contingently issuable per ASC 260-10, Earnings per Share and excludes such shares when they are not contingently issuable. The Company has excluded all performance-based awards underlying the fiscal 2011 and 2010 awards as those shares are not contingently issuable as of the end of the period.