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Share-based payments (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based payments |
Compensation Costs Related to Share-Based Payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended |  | Six months ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
SG&A expenses: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Stock option compensation expense | ​ | $ | 1,909 | ​ | $ | 1,543 | ​ | $ | 3,770 | ​ | $ | 2,730 | ​
Equity-classified share units | ​ | ​ | 4,404 | ​ | ​ | 3,231 | ​ | ​ | 7,557 | ​ | ​ | 5,017 | ​
Liability-classified share units | ​ | ​ | 526 | ​ | ​ | 971 | ​ | ​ | (1,389) | ​ | ​ | (185) | ​
Employee share purchase plan - employer contributions | ​ |  | 701 | ​ |  | 610 | ​ |  | 1,380 | ​ |  | 1,199 | ​
​ | ​ | ​ | 7,540 | ​ | ​ | 6,355 | ​ | ​ | 11,318 | ​ | ​ | 8,761 | ​
Acquisition-related costs: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​
Share-based continuing employment costs | ​ |  | 2,678 | ​ |  | — | ​ |  | 5,231 | ​ |  | — | ​
​ | ​ |  | 2,678 | ​ |  | — | ​ |  | 5,231 | ​ |  | — | ​
​ | ​ | $ | 10,218 | ​ | $ | 6,355 | ​ | $ | 16,549 | ​ | $ | 8,761 | ​
​
Summary of Stock Option Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | WA | ​ | ​ | ​
​ | ​ | Common | ​ | WA | ​ | remaining | ​ | Aggregate
​ | ​ | shares under | ​ | exercise | ​ | contractual | ​ | intrinsic
​ |  | option |  | price |  | life (in years) |  | value
Outstanding, December 31, 2020 |  | 1,985,754 | ​ | $ | 34.95 | ​ |  | 7.7 | ​ | $ | 68,717
Granted |  | 690,353 | ​ | ​ | 54.88 | ​ |  |  | ​ |  |
Exercised |  | (311,153) | ​ | ​ | 34.38 | ​ | ​ | ​ | ​ | ​ | 7,623
Forfeited |  | (23,808) | ​ | ​ | 46.88 | ​ |  |  | ​ |  |
Outstanding, June 30, 2021 |  | 2,341,146 | ​ | ​ | 40.78 | ​ |  | 7.9 | ​ | ​ | 43,379
Exercisable, June 30, 2021 |  | 980,404 | ​ | $ | 31.33 | ​ |  | 6.3 | ​ | $ | 27,402
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​ | ​ | ​
Six months ended June 30, |  | 2021 |  | 2020 |
Risk free interest rate |  | 0.5 | % | 0.7 | %
Expected dividend yield |  | 1.66 | % | 1.98 | %
Expected lives of the stock options |  | 4 | years | 5 | years
Expected volatility |  | 32.3 | % | 27.8 | %
​
Summary of Share Unit Activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Equity-classified awards | ​ | Liability-classified awards
​ | ​ | PSUs | ​ | RSUs | ​ | DSUs
​ | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | ​ | WA grant
​ | ​ | ​ | ​ | date fair | ​ | ​ | ​ | date fair | ​ | ​ | ​ | ​ | date fair
​ |  | Number |  | value |  | Number |  | value |  | ​ | Number |  | value
Outstanding, December 31, 2020 |  | 542,676 | ​ | $ | 38.09 |  | 134,937 | ​ | $ | 39.14 |  | ​ | 137,514 | ​ | $ | 32.06
Granted |  | 140,455 | ​ |  | 56.69 |  | 29,525 | ​ |  | 56.59 |  | ​ | 9,362 | ​ |  | 56.33
Vested and settled |  | (161,248) | ​ |  | 31.14 |  | (88,157) | ​ |  | 33.20 |  | ​ | — | ​ |  | —
Forfeited |  | (13,765) | ​ |  | 48.33 |  | (5,357) | ​ |  | 60.16 |  | ​ | — | ​ |  | —
Outstanding, June 30, 2021 |  | 508,118 | ​ | $ | 45.16 |  | 70,948 | ​ | $ | 52.21 |  | ​ | 146,876 | ​ | $ | 33.61

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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