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Earnings per share attributable to stockholders (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings per share attributable to stockholders |
Computation of Basic and Diluted Earnings Per Share | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net income | ​ | WA | ​ | Per
​ |  | attributable to |  | number |  | share
Year ended December 31, 2020 |  | stockholders |  | of shares |  | amount
Basic | ​ | $ | 170,095 |  | 109,054,493 | ​ | $ | 1.56
Effect of dilutive securities: | ​ |  | ​ |  | ​ | ​ |  | ​
Share units | ​ |  | — |  | 541,054 | ​ |  | (0.01)
Stock options | ​ |  | — |  | 715,437 | ​ |  | (0.01)
Diluted | ​ | $ | 170,095 |  | 110,310,984 | ​ | $ | 1.54
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net income | ​ | WA | ​ | Per
​ |  | attributable to |  | number |  | share
Year ended December 31, 2019 |  | stockholders |  | of shares |  | amount
Basic | ​ | $ | 149,039 |  | 108,519,739 | ​ | $ | 1.37
Effect of dilutive securities: | ​ |  |  |  |  | ​ |  |
Share units | ​ |  | — |  | 458,763 | ​ |  | —
Stock options | ​ |  | — |  | 780,621 | ​ |  | (0.01)
Diluted | ​ | $ | 149,039 |  | 109,759,123 | ​ | $ | 1.36
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Net income |  | WA |  | ​ | ​
​ | ​ | attributable to | ​ | number | ​ | Per share
Year ended December 31, 2018 | ​ | stockholders | ​ | of shares | ​ | amount
Basic | ​ | $ | 121,479 |  | 108,063,349 | ​ | $ | 1.12
Effect of dilutive securities: | ​ |  |  |  |  | ​ |  |
Share units | ​ |  | — |  | 459,503 | ​ |  | —
Stock options | ​ |  | — |  | 865,384 | ​ |  | (0.01)
Diluted | ​ | $ | 121,479 |  | 109,388,236 | ​ | $ | 1.11

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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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