EARNINGS PER SHARE:

Basic earnings per share are calculated by dividing net income by the weighted-average shares of common stock outstanding during the period. Diluted earnings per share are calculated by dividing net income by the weighted-average shares of common stock and dilutive common equivalent shares outstanding during the period. Dilutive common equivalent shares included in this calculation consist of dilutive shares issuable upon the assumed exercise of outstanding common stock options, the assumed vesting of outstanding restricted stock units, the assumed issuance of awards under the stock purchase plan and contingently issuable performance-based awards, as computed using the treasury stock method.

A summary of the earnings per share calculation is as follows:



	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In thousands, except per share amounts)	2018		2017		2018		2017
Basic earnings per share:
Net income	$	17,667	$	16,506	$	47,248	$	44,507
Weighted-average common shares	29,365		29,759		29,558		29,646
Basic earnings per share	$	0.60	$	0.55	$	1.60	$	1.50
Diluted earnings per share:⁽¹⁾
Net income	$	17,667	$	16,506	$	47,248	$	44,507
Weighted-average common shares	29,365		29,759		29,558		29,646
Effect of dilutive awards:
Employee stock plans	633		855		723		826
Diluted weighted-average common shares	29,998		30,614		30,281		30,472
Diluted earnings per share	$	0.59	$	0.54	$	1.56	$	1.46

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(1)

The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the outstanding performance-based awards in the 2018 and 2017 calculations as the shares were not contingently issuable as of the end of the reporting periods.

In the three and nine months ended September 30, 2018 and 2017, no outstanding stock awards were determined to be anti-dilutive and therefore excluded from the computation of diluted earnings per share.