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Share Capital and Employee Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of number and weighted average exercise prices of share options
Transactions concerning stock options are summarized as follows in CAD: 
 
 
Stock Options
 
 
 
 
Shares
 
Weighted
Average Exercise
Price CAD$
As at December 31, 2015
 
1,552,923

 
$
15.98

Granted
 
45,705

 
$
23.61

Exercised
 
(254,146
)
 
$
12.30

Expired
 
(9,352
)
 
$
24.70

Forfeited
 
(24,266
)
 
$
21.07

As at December 31, 2016
 
1,310,864

 
$
16.81

Granted
 
91,945

 
18.64

Exercised
 
(307,266
)
 
$
11.24

Expired
 
(61,891
)
 
40.22

Forfeited
 
(97,529
)
 
$
23.60

As at December 31, 2017
 
936,123

 
$
16.56
Disclosure of range of exercise prices of outstanding share options
The following table summarizes information concerning stock options outstanding and options exercisable as at December 31, 2017. The underlying option agreements are specified in Canadian dollar amounts. 
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise
Prices
CAD$
 
Number Outstanding as at December 31, 2017
 
Weighted Average
Remaining
Contractual Life
(months)
 
Weighted
Average
Exercise Price
CAD$
 
Number Exercisable as at December 31, 2017
 
Weighted
Average
Exercise
Price CAD$
$9.76 - $11.57
 
340,305

 
55.63

 
$
10.03

 
340,305

 
$
10.03

$11.58 - $17.01
 
99,742

 
50.99

 
$
11.81

 
99,742

 
$
11.81

$17.02 - $18.53
 
124,188

 
26.42

 
$
18.38

 
124,188

 
$
18.38

$18.54 - $24.90
 
371,888

 
36.44

 
$
23.19

 
257,093

 
$
24.79

 
 
936,123

 
43.64

 
$
16.56

 
821,328

 
$
16.13
Disclosure of dividends
The Company declared the following dividends for the period starting January 1, 2016 until March 22, 2018:
Declaration Date
 
Ex-dividend date
 
Dividend per common share
February 20, 2018 (1)
 
March 5, 2018
 
$
0.0350

November 8, 2017
 
November 20, 2017
 
$
0.0250

August 9, 2017
 
August 21, 2017
 
$
0.0250

May 9, 2017
 
May 23, 2017
 
$
0.0250

February 14, 2017
 
February 27, 2017
 
$
0.0250

November 14, 2016
 
November 25, 2016
 
$
0.0125

August 11, 2016
 
August 23, 2016
 
$
0.0125

May 11, 2016
 
May 24, 2016
 
$
0.0125

February 17, 2016
 
February 29, 2016
 
$
0.0125

(1)
These dividends were declared subsequent to the year end and have not been recognized as distributions to owners during the period presented.
Performance Share Units [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of number and aggregate fair value of other equity instruments
At December 31, 2017, the following PSU’s were outstanding:  
PSU
 
Number Outstanding
 
Fair Value
As at December 31, 2015
 
103,671

 
$
683

Granted
 
38,119

 
638

Paid out
 
—

 
—

Forfeited
 
—

 
—

Change in value
 
—

 
831

As at December 31, 2016
 
141,790

 
$
2,152

Granted
 
54,962

 
823

Paid out
 
(30,408
)
 
(875
)
Forfeited
 
—

 
—

Change in value
 
—

 
511

As at December 31, 2017
 
166,344

 
$
2,611
Restricted Share Units [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of number and aggregate fair value of other equity instruments
At December 31, 2017, the following RSU’s were outstanding:
RSU
 
Number Outstanding
 
Fair Value
As at December 31, 2015
 
380,144

 
$
2,495

Granted
 
164,132

 
2,919

Paid out
 
(224,805
)
 
(3,769
)
Forfeited
 
(4,048
)
 
(61
)
Change in value
 
—

 
3,180

As at December 31, 2016
 
315,423

 
$
4,764

Granted
 
184,187

 
2,698

Paid out
 
(222,006
)
 
(3,257
)
Forfeited
 
(15,591
)
 
(243
)
Change in value
 
—

 
136

As at December 31, 2017
 
262,013

 
$
4,098