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Share-based payments (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure Of Share-Based Payments [Abstract]  
Summary of Share Based Payments Expense
Share based payments expense consists of:
 
December 31, 2018

December 31, 2017

 
 
 
Share options
$
3,392

$
6,736

Restricted shares with no performance criteria
1,425

2,716

Restricted shares with performance criteria
175


Deferred units
(277
)
(1,023
)
Performance shares
2,274

2,789

 
$
6,989

$
11,218

Summary of Movements in Number of Share Options Outstanding and Weighted Average Exercise Prices
Movements in the number of share options outstanding and their related weighted average exercise prices are as follows:
 
2018
2017
 
Weighted
average price
Cdn$

Number of
options

Weighted
average price
Cdn$

Number of
options

At January 1,
30.18

5,944,510

37.75

5,779,205

Regular options granted
6.20

1,078,797

22.15

1,160,905

Exercised


16.10

(48,529
)
Expired
51.46

(870,904
)
73.89

(788,672
)
Forfeited
26.99

(561,175
)
33.78

(158,399
)
At December 31,
22.56

5,591,228

30.18

5,944,510

Summary of Range of Exercise Prices of Outstanding Share Options
Options outstanding are as follows:
 
 
December 31, 2018
 
 
Total options outstanding
 
Exercisable options
Range of 
exercise 
price 
Cdn$
 
Shares

 
Weighted
average
remaining
contractual
life
(years)

 
Weighted
average
exercise
price
Cdn$

 
Shares

 
Weighted 
average 
exercise 
price 
Cdn$

 
 
 
 
 
 
 
 
 
 
 
$6.00 to $6.99
 
1,070,517

 
4.3

 
6.20

 

 

$16.00 to $16.99
 
1,350,527

 
2.1

 
16.10

 
1,011,048

 
16.10

$18.00 to $18.99
 
2,591

 
2.1

 
18.55

 
1,727

 
18.55

$19.00 to $19.99
 
20,000

 
1.8

 
19.80

 
20,000

 
19.80

$21.00 to $21.99
 
20,000

 
2.8

 
21.15

 
13,333

 
21.15

$22.00 to $22.99
 
932,971

 
3.1

 
22.00

 
437,527

 
22.00

$23.00 to $23.99
 
151,933

 
3.2

 
23.18

 
50,643

 
23.18

$29.00 to $29.99
 
2,449

 
2.4

 
29.55

 
1,632

 
29.55

$30.00 to $30.99
 
27,800

 
0.8

 
30.75

 
27,800

 
30.75

$31.00 to $31.99
 
4,828

 
0.3

 
31.90

 
4,828

 
31.90

$33.00 to $33.99
 
1,159,157

 
1.1

 
33.35

 
1,159,157

 
33.35

$34.00 to $34.99
 
20,000

 
0.3

 
34.15

 
20,000

 
34.15

$35.00 to $35.99
 
20,000

 
1.0

 
35.40

 
20,000

 
35.40

$39.00 to $39.99
 
808,455

 
0.2

 
39.20

 
808,455

 
39.20

 
 
5,591,228

 
2.2

 
22.56

 
3,576,150

 
28.13

Summary of Assumptions Used to Estimate the Fair Value of Options Granted
The assumptions used to estimate the fair value of options granted during the years ended December 31, 2018 and 2017 were:
 
2018

2017

Risk-free interest rate (range) (%)
1.80 – 2.20

0.70 – 1.05

Expected volatility (range) (%)
58 – 64

60 – 65

Expected life (range) (years)
1.79 – 3.79

1.80 – 3.80

Expected dividends (CDN$)

0.02

Forfeiture rate (%)
8.0

11.0

Summary of Status and Movements in RSUs and PSUs
Movements in the PSUs during the year ended December 31, 2018 are as follows:
 
2018

2017

At January 1,
381,293

286,188

Granted
261,522

113,938

Expired
(118,605
)

Forfeited
(39,311
)
(18,833
)
At December 31,
484,899

381,293

A summary of the status of the RSUs with no performance criteria and changes during the year ended December 31, 2018 is as follows:

2018

2017

At January 1,
341,198

248,013

Granted
214,859

187,366

Redeemed
(181,491
)
(69,968
)
Forfeited
(41,447
)
(24,213
)
At December 31,
333,119

341,198

A summary of the status of the RSUs with performance criteria and changes during the year ended December 31, 2018 is as follows:
 
2018

At January 1,

Granted
167,976

Forfeited
(15,049
)
At December 31,
152,927