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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

Three months ended

 

Six months ended

June 30, 

June 30, 

    

2022

    

2021

    

2022

    

2021

Selling, general and administrative:

 

  

 

  

 

  

 

  

Stock option compensation expense

$

3,056

$

1,909

$

5,623

$

3,770

Equity-classified share units

8,801

4,404

11,691

7,557

Liability-classified share units

1,075

526

319

(1,389)

Employee share purchase plan - employer contributions

 

708

 

701

 

1,393

 

1,380

13,640

7,540

19,026

11,318

Acquisition-related costs:

 

 

 

Share-based continuing employment costs

 

2,080

 

2,678

 

4,213

 

5,231

 

2,080

 

2,678

 

4,213

 

5,231

$

15,720

$

10,218

$

23,239

$

16,549

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

689,437

58.02

 

 

119,157

91.37

Exercised

(80,183)

35.70

1,964

Forfeited

(36,126)

42.85

 

 

(17,789)

90.93

 

 

Outstanding, June 30, 2022

2,781,185

46.58

7.8

51,797

1,118,432

91.26

5.2

Exercisable, June 30, 2022

1,307,090

37.42

6.5

36,130

 

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

 

225,382

 

58.66

14,574

 

69.92

33,827

 

57.68

 

12,124

 

56.78

Vested and settled

 

(93,241)

 

36.42

 

(22,349)

 

46.01

 

 

Forfeited

 

(3,474)

 

51.04

 

(3,891)

 

61.55

 

 

Outstanding at June 30, 2022

 

652,285

$

51.64

102,879

$

66.08

86,699

$

58.03

 

168,713

$

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

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

Six months ended June 30, 

    

2022

    

2021

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

Six months ended June 30, 

    

2022

    

2021

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

34.4

%  

%