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Share-Based Payments (Tables)
9 Months Ended
Sep. 30, 2019
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, 

    

2019

    

2018

    

2019

    

2018

Stock option compensation expense:

 

  

 

  

 

  

 

  

SG&A expenses

$

1,653

$

2,066

$

4,852

$

6,354

Acquisition-related costs

 

 

162

 

 

357

Share unit expense:

 

 

  

 

  

 

  

Equity-classified share units

 

2,851

 

2,718

 

8,754

 

8,978

Liability-classified share units

 

589

 

300

 

829

 

2,245

Employee share purchase plan - employer contributions

 

567

 

538

 

1,692

 

1,630

$

5,660

$

5,784

$

16,127

$

19,564

Summary of Stock Option Activity

WA

Common

WA

remaining

Aggregate

shares under

exercise

contractual

intrinsic

    

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

 

(544,576)

 

22.84

 

 

7,939

Forfeited

 

(61,358)

 

26.26

 

  

 

Outstanding, September 30, 2019

 

4,321,997

 

28.47

 

7.2

 

49,396

Exercisable, September 30, 2019

 

2,548,247

$

25.76

 

6.1

$

36,041

Summary of Stock Option and Performance Share Unit Pricing Assumptions

Nine months ended September 30,

    

2019

    

2018

Risk free interest rate

 

2.5

%  

2.7

%

Expected dividend yield

 

2.06

%  

2.11

%

Expected lives of the stock options

 

5 years

 

5 years

Expected volatility

 

26.8

%  

28.1

%

Summary of Share Unit Activity

Equity-classified awards

Liability-classified awards  

PSUs

RSUs

DSUs

WA grant

WA grant

WA grant

date fair

date fair

date fair

    

Number

    

value

    

Number

    

value

    

Number

    

value

Outstanding, December 31, 2018

 

670,288

$

31.46

 

207,986

$

28.99

 

113,435

$

28.16

Granted

 

168,225

 

36.17

 

35,251

 

35.58

 

19,487

 

34.93

Vested and settled

 

(251,883)

 

30.33

 

(265)

 

31.98

 

 

Forfeited

 

(20,282)

 

31.76

 

(4,797)

 

34.89

 

 

Outstanding, September 30, 2019

 

566,348

$

33.00

 

238,175

$

29.74

 

132,922

$

28.90

Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option and Performance Share Unit Pricing Assumptions

Nine months ended September 30,

    

2018

Risk free interest rate

 

1.9

%

Expected dividend yield

 

2.09

%

Expected lives of the PSUs

 

3 years

Expected volatility

 

31.1

%

Average expected volatility of comparable companies

 

34.1

%