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

Three months ended

 

Nine months ended

September 30, 

September 30, 

    

2022

    

2021

    

2022

    

2021

Selling, general and administrative:

 

  

 

  

 

  

 

  

Stock option compensation expense

$

3,249

$

2,133

$

8,871

$

5,903

Equity-classified share units

4,759

2,283

16,450

9,840

Liability-classified share units

108

527

427

(862)

Employee share purchase plan - employer contributions

 

690

 

684

 

2,085

 

2,064

8,806

5,627

27,833

16,945

Acquisition-related costs:

 

 

 

Share-based continuing employment costs

 

1,863

 

2,707

 

6,075

 

7,938

 

1,863

 

2,707

 

6,075

 

7,938

$

10,669

$

8,334

$

33,908

$

24,883

Summary of Stock Option Activity

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, 2021

2,208,057

$

42.55

7.7

$

41,884

1,017,064

$

91.24

5.7

$

Granted

697,536

58.14

 

 

119,157

91.37

Exercised

(155,694)

37.02

4,359

Forfeited

(20,662)

47.96

 

 

(17,789)

90.93

 

 

Outstanding, September 30, 2022

2,729,237

$

46.81

7.6

$

43,405

1,118,432

$

91.26

4.9

$

Exercisable, September 30, 2022

1,280,995

$

37.62

6.3

$

31,859

$

 

$

Summary of Share Unit Activity

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 at December 31, 2021

 

523,618

$

45.90

88,305

$

65.45

79,112

$

54.96

 

156,589

$

35.28

Granted

 

230,122

 

58.68

14,574

 

69.92

34,135

 

57.70

 

16,182

 

59.57

Vested and settled

 

(93,241)

 

36.42

 

(27,850)

 

44.02

 

 

Forfeited

 

(3,503)

 

50.97

 

(6,070)

 

59.67

 

 

Outstanding at September 30, 2022

 

656,996

$

51.70

102,879

$

66.08

79,327

$

59.62

 

172,771

$

37.55

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

Nine months ended September 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

 

31.8

%  

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

Nine months ended September 30, 

    

2022

    

2021

Risk free interest rate

 

3.0

%  

1.00

%  

Expected dividend yield

 

1.63

%  

1.66

%  

Expected lives of the stock options

4

years

5

years

Expected volatility

 

30.2

%  

30.6

%  

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

Nine months ended September 30, 

    

2022

    

2021

Risk free interest rate

 

2.7

%  

0.5

%  

Expected dividend yield

 

1.63

%  

1.63

%  

Expected lives of the PSUs

2

years

3

years

Expected volatility

 

33.4

%  

31.0

%  

Average expected volatility of comparable companies

34.4

%  

38.6

%