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Share-based payments (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Compensation Costs Related to Share-Based Payments | Share-based payments consist of the following compensation costs:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, |  | ​ | 2021 |  | 2020 |  | 2019
SG&A expenses: |  | ​ | ​ |  |  | ​ |  |  | ​ |
Stock option compensation expense | ​ | ​ | $ | 8,365 | ​ | $ | 5,853 | ​ | $ | 4,697
Equity-classified share units | ​ | ​ | ​ | 12,574 | ​ |  | 9,897 | ​ |  | 8,047
Liability-classified share units | ​ | ​ | ​ | (580) | ​ |  | 3,635 | ​ |  | 1,380
Employee share purchase plan - employer contributions | ​ | ​ |  | 2,747 | ​ |  | 2,497 | ​ |  | 2,281
​ | ​ | ​ | ​ | 23,106 | ​ | ​ | 21,882 | ​ | ​ | 16,405
Acquisition-related costs: | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Share-based continuing employment costs | ​ | ​ |  | 10,771 | ​ | ​ | 802 | ​ | ​ | —
​ | ​ | ​ |  | 10,771 | ​ | ​ | 802 | ​ | ​ | —
​ | ​ | ​ | $ | 33,877 | ​ | $ | 22,684 | ​ | $ | 16,405
Summary of Stock Option Activity | Stock option activity is presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Stock options | ​ | Premium-priced stock options
​ | ​ | ​ | ​ | ​ | ​ | WA | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | WA | ​ | ​ | ​
​ | Common | ​ | WA | ​ | remaining | ​ | Aggregate | ​ | Common | ​ | WA | ​ | remaining | ​ | Aggregate
​ | shares under | ​ | exercise | ​ | contractual | ​ | intrinsic | ​ | shares under | ​ | exercise | ​ | contractual | ​ | intrinsic
​ | option |  | price |  | life (in years) |  | value |  | option |  | price |  | life (in years) |  | value
Outstanding, December 31, 2018 | 4,013,863 | ​ | $ | 26.41 | ​ |  | 7.2 | ​ | $ | 25,374 | ​ | — | ​ | $ | — | ​ |  | — | ​ | ​ | —
Granted | 914,068 | ​ |  | 34.03 | ​ |  | — | ​ |  | — | ​ | — | ​ |  | — | ​ |  | — | ​ | ​ | —
Exercised | (1,672,022) | ​ |  | 24.58 | ​ | ​ | — | ​ | ​ | 27,349 | ​ | — | ​ |  | — | ​ | ​ | — | ​ | ​ | —
Forfeited | (458,092) | ​ |  | 32.15 | ​ |  | — | ​ |  | — | ​ | — | ​ |  | — | ​ |  | — | ​ | ​ | —
Expired | (628) | ​ | ​ | 24.44 | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Outstanding, December 31, 2019 | 2,797,189 | ​ | $ | 29.05 | ​ |  | 7.1 | ​ | $ | 38,874 | ​ | — | ​ | $ | — | ​ |  | — | ​ | ​ | —
Granted | 822,626 | ​ |  | 41.94 | ​ |  | — | ​ |  | — | ​ | — | ​ |  | — | ​ |  | — | ​ | ​ | —
Exercised | (1,563,941) | ​ |  | 28.22 | ​ | ​ | — | ​ | ​ | 37,062 | ​ | — | ​ |  | — | ​ | ​ | — | ​ | ​ | —
Forfeited | (68,056) | ​ |  | 34.30 | ​ |  | — | ​ |  | — | ​ | — | ​ |  | — | ​ |  | — | ​ |  | —
Expired | (2,064) | ​ | ​ | 20.74 | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Outstanding, December 31, 2020 | 1,985,754 | ​ | $ | 34.95 | ​ |  | 7.7 | ​ | $ | 68,717 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Granted | 758,256 | ​ | ​ | 56.29 | ​ |  | — | ​ |  | — | ​ | 1,017,064 | ​ | ​ | 91.24 | ​ | ​ | — | ​ | ​ | —
Exercised | (495,021) | ​ | ​ | 32.83 | ​ | ​ | — | ​ | ​ | 14,147 | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Forfeited | (40,932) | ​ | ​ | 45.86 | ​ |  | — | ​ |  | — | ​ | — | ​ | ​ | — | ​ |  | — | ​ |  | —
Outstanding, December 31, 2021 | 2,208,057 | ​ | ​ | 42.55 | ​ | ​ | 7.7 | ​ | ​ | 41,884 | ​ | 1,017,064 | ​ | ​ | 91.24 | ​ | ​ | 5.7 | ​ | ​ | —
Exercisable, December 31, 2021 | 858,928 | ​ | ​ | 32.51 | ​ | ​ | 6.2 | ​ | ​ | 24,667 | ​ | — | ​ | $ | — | ​ |  | — | ​ | $ | —
Summary of Share Unit Activity | In 2021, the Company granted PSUs with market conditions to senior executives. ​ Share unit activity is presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Equity-classified awards | ​ | Liability-classified awards
​ | ​ | PSUs | ​ | PSUs with Market Conditions | ​ | RSUs | ​ | DSUs
​ | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | WA grant | ​ | ​ | ​ | ​ | WA grant
​ | ​ | ​ | ​ | date fair | ​ | ​ | ​ | date fair | ​ | ​ | ​ | date fair | ​ | ​ | ​ | ​ | date fair
​ |  | Number |  | value |  | Number |  | value |  | Number |  | value |  | ​ | Number |  | value
Outstanding, December 31, 2018 |  | 670,288 | ​ | $ | 31.46 | ​ | — | ​ | $ | — | ​ | 207,986 | ​ | $ | 28.99 |  | ​ | 113,435 | ​ | $ | 28.16
Granted |  | 170,208 | ​ |  | 36.13 | ​ | — | ​ |  | — | ​ | 36,350 | ​ |  | 35.40 |  | ​ | 24,810 | ​ |  | 35.99
Vested and settled |  | (251,883) | ​ |  | 30.33 | ​ | — | ​ |  | — | ​ | (265) | ​ |  | 31.98 |  | ​ | (19,877) | ​ |  | 27.45
Forfeited |  | (159,889) | ​ |  | 33.21 | ​ | — | ​ |  | — | ​ | (6,651) | ​ |  | 34.27 |  | ​ | — | ​ |  | —
Outstanding, December 31, 2019 |  | 428,724 | ​ | $ | 32.89 | ​ | — | ​ | $ | — | ​ | 237,420 | ​ | $ | 29.72 |  | ​ | 118,368 | ​ | $ | 29.64
Granted |  | 303,829 | ​ |  | 42.09 | ​ | — | ​ |  | — | ​ | 45,781 | ​ |  | 51.36 |  | ​ | 19,146 | ​ |  | 47.01
Vested and settled |  | (156,238) | ​ |  | 31.94 | ​ | — | ​ |  | — | ​ | (98,542) | ​ |  | 27.68 |  | ​ | — | ​ |  | —
Forfeited |  | (33,639) | ​ |  | 36.60 | ​ | — | ​ |  | — | ​ | (49,722) | ​ |  | 28.14 |  | ​ | — | ​ |  | —
Outstanding, December 31, 2020 |  | 542,676 | ​ | $ | 38.09 | ​ | — | ​ | $ | — | ​ | 134,937 | ​ | $ | 39.14 |  | ​ | 137,514 | ​ | $ | 32.06
Granted |  | 160,713 | ​ |  | 57.67 | ​ | 88,305 | ​ |  | 65.45 | ​ | 46,675 | ​ |  | 60.98 |  | ​ | 19,075 | ​ |  | 58.48
Vested and settled |  | (161,248) | ​ |  | 31.14 | ​ | — | ​ |  | — | ​ | (93,426) | ​ |  | 35.04 |  | ​ | — | ​ |  | —
Forfeited |  | (18,523) | ​ |  | 47.58 | ​ | — | ​ |  | — | ​ | (9,074) | ​ |  | 55.81 |  | ​ | — | ​ |  | —
Outstanding, December 31, 2021 |  | 523,618 | ​ | $ | 45.90 | ​ | 88,305 | ​ | $ | 65.45 | ​ | 79,112 | ​ | $ | 54.96 |  | ​ | 156,589 | ​ | $ | 35.28
​
Stock Option Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, |  | 2021 |  | 2020 |  | 2019 |
Risk free interest rate |  | 0.5 | % | 0.7 | % | 2.5 | %
Expected dividend yield |  | 1.64 | % | 1.96 | % | 2.06 | %
Expected lives of the stock options |  | 4 | years | 5 | years | 5 | years
Expected volatility |  | 32.3 | % | 28.0 | % | 26.8 | %
Premium Priced Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​
Year ended December 31, |  | 2021 |
Risk free interest rate |  | 1.1 | %
Expected dividend yield |  | 1.59 | %
Expected lives of the stock options | ​ | 5 | years
Expected volatility |  | 30.6 | %
Performance Share Units, Equity Classified Awards [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | ​
​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2021 |  | ​
Risk free interest rate | ​ | 0.5 | % | ​
Expected dividend yield | ​ | 1.63 | % | ​
Expected lives of the PSUs | ​ | 3 | years | ​
Expected volatility | ​ | 31.0 | % | ​
Average expected volatility of comparable companies | ​ | 38.6 | % | ​

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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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