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Share-based payments (Tables)
9 Months Ended
Sep. 30, 2021
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, 

    

2021

    

2020

    

2021

    

2020

SG&A expenses:

 

  

 

  

 

  

 

  

Stock option compensation expense

$

2,133

$

1,671

$

5,903

$

4,401

Equity-classified share units

2,283

4,138

9,840

9,155

Liability-classified share units

527

2,123

(862)

1,938

Employee share purchase plan - employer contributions

 

684

 

636

 

2,064

 

1,835

5,627

8,568

16,945

17,329

Acquisition-related costs:

 

 

 

Share-based continuing employment costs

 

2,707

 

 

7,938

 

 

2,707

 

 

7,938

 

$

8,334

$

8,568

$

24,883

$

17,329

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, 2020

1,985,754

$

34.95

 

7.7

$

68,717

$

 

$

Granted

690,353

54.88

 

  

 

  

721,980

91.37

 

5.9

 

  

Exercised

(411,856)

33.79

10,652

Forfeited

(27,130)

46.69

 

  

 

  

 

  

 

  

Outstanding, September 30, 2021

2,237,121

41.17

 

7.7

45,878

721,980

91.37

 

5.9

Exercisable, September 30, 2021

929,944

$

31.85

 

6.1

$

27,718

$

 

$

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, December 31, 2020

 

542,676

$

38.09

$

134,937

$

39.14

 

137,514

$

32.06

Granted

 

142,847

 

56.55

88,305

 

65.45

29,805

 

56.55

 

14,569

 

56.42

Vested and settled

 

(161,248)

 

31.14

 

(88,348)

 

33.20

 

 

Forfeited

 

(16,878)

 

47.36

 

(6,347)

 

58.58

 

 

Outstanding, September 30, 2021

 

507,397

$

45.18

88,305

$

65.45

70,047

$

52.28

 

152,083

$

34.39

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, 

    

2021

    

2020

    

Risk free interest rate

 

0.5

%  

0.7

%

Expected dividend yield

 

1.66

%  

1.96

%

Expected lives of the stock options

 

4

years

5

years

Expected volatility

 

32.3

%  

27.9

%

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

August 12, 2021

    

2021

    

Risk free interest rate

 

1.0

%  

Expected dividend yield

 

1.66

%  

Expected lives of the stock options

5

years

Expected volatility

 

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

August 12, 2021

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

%