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



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Basic earnings per share:
Net income	$	7,512	$	12,634	$	27,965	$	40,534
Weighted-average common shares	28,799		27,894		28,789		27,737
Basic earnings per share	$	0.26	$	0.45	$	0.97	$	1.46
Diluted earnings per share (1):
Net income	$	7,512	$	12,634	$	27,965	$	40,534
Weighted-average common shares	28,799		27,894		28,789		27,737
Effect of dilutive securities:
Employee stock plans	1,080		1,389		1,406		1,669
Diluted weighted-average common shares	29,879		29,283		30,195		29,406
Diluted earnings per share	$	0.25	$	0.43	$	0.93	$	1.38

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(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 were not contingently issuable as of the end of the period.