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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of earnings per share
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 1,432,789 and 1,698,735 for the nine months ended September 30, 2020 and 2021, respectively, and 675,214 and 1,556,671 for the three months ended September 30, 2020 and 2021, respectively.
 
Three months ended September 30,Nine months ended September 30,
2020202120202021
Net income $85,435 $102,386 $233,294 $296,363 
Weighted average number of common shares used in computing basic earnings per common share190,949,108 187,856,026 190,705,671 187,945,234 
Dilutive effect of stock-based awards5,706,0325,303,903 5,394,3964,940,018
Weighted average number of common shares used in computing dilutive earnings per common share196,655,140193,159,929 196,100,067192,885,252
Earnings per common share
Basic$0.45 $0.55 $1.22 $1.58 
Diluted$0.43 $0.53 $1.19 $1.54