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EARNINGS PER SHARE
9 Months Ended
Sep. 30, 2023
EARNINGS PER SHARE  
EARNINGS PER SHARE

9. 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)

    

2023

    

2022

    

2023

    

2022

Basic earnings per share:

 

  

 

  

 

  

 

  

Net income

$

19,796

$

45,964

$

41,464

$

148,036

Weighted-average common shares

 

57,383

 

57,172

 

57,282

 

58,039

Basic earnings per share

$

0.34

$

0.80

$

0.72

$

2.55

Diluted earnings per share: (1)

 

  

 

  

 

  

 

  

Net income

$

19,796

$

45,964

$

41,464

$

148,036

Weighted-average common shares

 

57,383

 

57,172

 

57,282

 

58,039

Effect of dilutive awards:

 

  

 

  

 

  

 

  

Employee stock plans

 

358

 

431

 

429

 

596

Diluted weighted-average common shares

 

57,741

 

57,603

 

57,711

 

58,635

Diluted earnings per share

$

0.34

$

0.80

$

0.72

$

2.52

(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 2023 and 2022 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, 2023 and 2022, no outstanding stock awards were determined to be anti-dilutive and therefore excluded from the computation of diluted earnings per share.