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Earnings per share (Tables)
 3 Months Ended
Mar. 31, 2023
Earnings Per Share [Abstract]  
Schedule of reconciliation of numerators and denominators of basic and diluted computations A reconciliation of the numerators and the denominators of the basic and diluted earning per common share computations is as follows (in thousands, except per share amounts):
Three Months Ended
 March 31,
 20232022
Numerator
Net income$39,615 $60,108 
Denominator
Weighted average common shares outstanding for basic earnings per share135,027 137,658 
Dilutive potential common stock outstanding
Stock Options2,173 2,043 
RSUs, PSUs and ESPP468 317 
Convertible Notes232 1,259 
Weighted average common shares outstanding for diluted earnings per share137,900 141,277 
Earnings per share:
Basic$0.29 $0.44 
Diluted$0.29 $0.43 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
Shares which have been excluded from the calculation of diluted earnings per common share because their effect was anti-dilutive, include the following (shares in millions):
Three Months Ended
 March 31,
 20232022
Anti-dilutive securities (1)
26.2 15.4 
(1) The anti-dilutive securities include outstanding stock options, unvested RSUs, unvested PSUs, common shares expected to be issued under our ESPP and Convertible Notes