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Earnings per share (Tables) | 9 Months Ended
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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,
| 2020 |  | 2021 |  | 2020 |  | 2021
Net income | $ | 85,435 |  |  | $ | 102,386 |  |  | $ | 233,294 |  |  | $ | 296,363 |
Weighted average number of common shares used in computing basic earnings per common share | 190,949,108 |  |  | 187,856,026 |  |  | 190,705,671 |  |  | 187,945,234 |
Dilutive effect of stock-based awards | 5,706,032 |  | 5,303,903 |  |  | 5,394,396 |  | 4,940,018
Weighted average number of common shares used in computing dilutive earnings per common share | 196,655,140 |  | 193,159,929 |  |  | 196,100,067 |  | 192,885,252
Earnings per common share |  |  |  |  |  |  |
Basic | $ | 0.45 |  |  | $ | 0.55 |  |  | $ | 1.22 |  |  | $ | 1.58 |
Diluted | $ | 0.43 |  |  | $ | 0.53 |  |  | $ | 1.19 |  |  | $ | 1.54 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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