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Share-based payments (Tables)
6 Months Ended
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation Costs Related to Share-Based Payments

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Three months ended

 

Six months ended

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June 30, 

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June 30, 

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​

    

2022

    

2021

    

2022

    

2021

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Selling, general and administrative:

 

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​

  

 

​

  

 

​

  

​

Stock option compensation expense

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$

3,056

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$

1,909

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$

5,623

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$

3,770

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Equity-classified share units

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​

8,801

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​

4,404

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​

11,691

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​

7,557

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Liability-classified share units

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​

1,075

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​

526

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​

319

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​

(1,389)

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Employee share purchase plan - employer contributions

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708

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701

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1,393

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1,380

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​

​

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13,640

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7,540

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19,026

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11,318

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Acquisition-related costs:

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​

​

 

​

​

 

​

​

​

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Share-based continuing employment costs

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2,080

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2,678

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4,213

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5,231

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2,080

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2,678

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4,213

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5,231

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$

15,720

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$

10,218

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$

23,239

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$

16,549

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Summary of Stock Option Activity

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Stock options

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Premium-priced stock options

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WA

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WA

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Common

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WA

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remaining

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Aggregate

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Common

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WA

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remaining

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Aggregate

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shares under

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exercise

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contractual

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intrinsic

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shares under

​

exercise

​

contractual

​

intrinsic

​

option

  

price

  

life (in years)

  

value

  

option

  

price

  

life (in years)

  

value

Outstanding, December 31, 2021

2,208,057

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​

42.55

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​

7.7

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​

41,884

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1,017,064

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​

91.24

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​

5.7

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​

—

Granted

689,437

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​

58.02

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—

​

 

—

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119,157

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91.37

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—

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—

Exercised

(80,183)

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35.70

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—

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1,964

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—

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—

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—

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—

Forfeited

(36,126)

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42.85

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—

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—

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(17,789)

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90.93

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—

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—

Outstanding, June 30, 2022

2,781,185

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46.58

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7.8

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51,797

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1,118,432

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91.26

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​

5.2

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—

Exercisable, June 30, 2022

1,307,090

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37.42

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6.5

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36,130

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—

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—

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—

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—

Summary of Share Unit Activity

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Equity-classified awards

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Liability-classified awards

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PSUs

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PSUs with Market Conditions

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RSUs

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DSUs

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WA grant

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WA grant

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WA grant

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WA grant

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date fair

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date fair

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date fair

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date fair

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Number

  

value

  

Number

  

value

  

Number

  

value

  

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Number

  

value

Outstanding at December 31, 2021

 

523,618

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$

45.90

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88,305

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$

65.45

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79,112

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$

54.96

 

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156,589

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$

35.28

Granted

 

225,382

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58.66

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14,574

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69.92

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33,827

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57.68

 

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12,124

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56.78

Vested and settled

 

(93,241)

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36.42

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—

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—

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(22,349)

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46.01

 

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—

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—

Forfeited

 

(3,474)

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51.04

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—

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—

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(3,891)

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61.55

 

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—

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—

Outstanding at June 30, 2022

 

652,285

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$

51.64

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102,879

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$

66.08

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86,699

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$

58.03

 

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168,713

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$

36.82

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

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Six months ended June 30, 

    

2022

    

2021

    

Risk free interest rate

 

2.2

%  

0.5

%

Expected dividend yield

 

1.74

%  

1.66

%

Expected lives of the stock options

 

4

years

4

years

Expected volatility

 

31.7

%  

32.3

%

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

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Six months ended June 30, 

    

2022

    

2021

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Risk free interest rate

 

3.0

%  

—

%  

Expected dividend yield

 

1.63

%  

—

%  

Expected lives of the stock options

​

4

years

—

years

Expected volatility

 

30.2

%  

—

%  

Performance Share Units With Market Conditions [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

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Six months ended June 30, 

    

2022

    

2021

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Risk free interest rate

 

2.7

%  

—

%  

Expected dividend yield

 

1.63

%  

—

%  

Expected lives of the PSUs

​

2

years

—

years

Expected volatility

 

33.4

%  

—

%  

Average expected volatility of comparable companies

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34.4

%  

—

%