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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 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
 June 30,		Six Months Ended
June 30,
 2023202220232022
Numerator
Net income$74,754 $22,685 $114,369 $82,793 
Denominator
Weighted average common shares outstanding for basic earnings per share131,730 137,937 133,369 137,798 
Dilutive potential common stock outstanding
Stock options1,656 2,274 1,910 2,182 
RSUs, PSUs and ESPP157 296 363 331 
Convertible Notes— 1,709 116 1,484 
Weighted average common shares outstanding for diluted earnings per share133,543 142,216 135,758 141,795 
Earnings per share
Basic$0.57 $0.16 $0.86 $0.60 
Diluted$0.56 $0.16 $0.84 $0.58 
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
 June 30,		Six Months Ended
June 30,
 2023202220232022
Anti-dilutive securities (1)
27.7 15.0 27.4 15.3 
(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