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Earnings per share
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Earnings per share Earnings per share
 
The Company calculates earnings per share in accordance with FASB guidance on earnings per share. Basic and diluted earnings per common share give effect to the change in the number of Company common shares outstanding. The calculation of basic earnings per common share is determined by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the respective periods. The potentially dilutive shares, consisting of outstanding options on common shares, RSUs, common shares to be issued under the ESPP and PUs, have been included in the computation of diluted net earnings per share and the number of weighted average shares outstanding, except where the result would be anti-dilutive.

The number of shares subject to stock awards outstanding but not included in the computation of diluted earnings per common share because their effect was anti-dilutive is 2,774,924 and 952,901 for the nine months ended September 30, 2024 and 2025, respectively, and 2,768,762 and 1,121,406 for the three months ended September 30, 2024 and 2025, respectively.

Three months ended September 30, Nine months ended September 30,
2024202520242025
Net income $132,818 $145,831 $371,755 $409,400 
Weighted average number of common shares used in computing basic earnings per common share177,595,400 173,576,957 179,221,213 174,572,169 
Dilutive effect of stock-based awards2,118,8232,527,6201,633,4692,625,187
Weighted average number of common shares used in computing dilutive earnings per common share179,714,223176,104,577180,854,682177,197,356
Earnings per common share
Basic$0.75 $0.84 $2.07 $2.35 
Diluted$0.74 $0.83 $2.06 $2.31