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Earnings per share attributable to stockholders (Tables) | 6 Months Ended
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Jun. 30, 2022
Earnings per share attributable to stockholders |
Computation of Basic and Diluted Earnings Per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, 2022 | ​ | June 30, 2022
​ | ​ | Net income | ​ | WA | ​ | Per | ​ | Net income | ​ | WA | ​ | Per
​ |  | attributable to |  | number |  | share | ​ | attributable to |  | number |  | share
​ |  | stockholders |  | of shares |  | amount | ​ | stockholders |  | of shares |  | amount
Basic | ​ | $ | 53,365 |  | 110,760,339 | ​ | $ | 0.48 | ​ | $ | 231,459 |  | 110,705,182 | ​ | $ | 2.09
Effect of dilutive securities: | ​ |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |  | ​ | ​ |  | ​
Share units | ​ |  | — |  | 397,274 | ​ |  | — | ​ |  | — |  | 423,767 | ​ |  | (0.01)
Stock options | ​ |  | — |  | 547,489 | ​ |  | — | ​ |  | — |  | 552,695 | ​ |  | (0.01)
Diluted | ​ | $ | 53,365 |  | 111,705,102 | ​ | $ | 0.48 | ​ | $ | 231,459 |  | 111,681,644 | ​ | $ | 2.07
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, 2021 | ​ | June 30, 2021
​ | ​ | Net income | ​ | WA | ​ | Per | ​ | Net income | ​ | WA | ​ | Per
​ |  | attributable to |  | number |  | share | ​ | attributable to |  | number |  | share
​ |  | stockholders |  | of shares |  | amount |  | stockholders |  | of shares |  | amount
Basic | ​ | $ | 60,749 | ​ | 110,311,615 | ​ | $ | 0.55 | ​ | $ | 88,937 |  | 110,144,229 | ​ | $ | 0.81
Effect of dilutive securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ |  | ​ | ​ |  | ​
Share units | ​ | ​ | — | ​ | 322,371 | ​ | ​ | — | ​ |  | — |  | 450,752 | ​ |  | —
Stock options | ​ | ​ | — | ​ | 700,198 | ​ | ​ | — | ​ |  | — |  | 707,730 | ​ |  | (0.01)
Diluted | ​ | $ | 60,749 | ​ | 111,334,184 | ​ | $ | 0.55 | ​ | $ | 88,937 |  | 111,302,711 | ​ | $ | 0.80

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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=124432515&loc=d3e3550-109257 + Details
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