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Share-Based Compensation And Other Related Information (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of number and weighted average exercise prices of share options
The following table summarizes changes in stock options for the years ended December 31:
 
 
Stock Options
 
 
 
 
Shares
 
Weighted
Average Exercise
Price CAD$
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

Granted
 
149,163

 
17.53

Exercised
 
(125,762
)
 
$
11.14

Expired
 
(211,614
)
 
24.90

Forfeited
 
(49,523
)
 
$
19.49

As at December 31, 2018
 
698,387

 
$
15.00

Disclosure of range of exercise prices of outstanding share options
The following table summarizes information about the Company's stock options outstanding at December 31, 2018:
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise
Prices
CAD$
 
Number Outstanding as at December 31, 2018
 
Weighted Average
Remaining
Contractual Life
(months)
 
Weighted
Average
Exercise Price
CAD$
 
Number Exercisable as at December 31, 2018
 
Weighted
Average
Exercise
Price CAD$
$9.76 - $11.57
 
232,883

 
43.08

 
$
10.07

 
232,883

 
$
10.07

$11.58 - $17.01
 
97,043

 
40.16

 
$
12.50

 
97,043

 
$
12.50

$17.02 - $18.53
 
230,811

 
57.74

 
$
17.88

 
81,648

 
$
18.53

$18.54 - $23.61
 
137,650

 
67.28

 
$
20.29

 
91,680

 
$
21.12

 
 
698,387

 
52.29

 
$
15.00

 
503,254

 
$
13.92

Disclosure of assumptions used in determining fair value of options granted
The following assumptions were used in the Black-Scholes option pricing model in determining the fair value of options granted during the years ended December 31:
 
 
2018
 
2017
Expected life
 
4.0

 
4.0

Expected volatility
 
43.8
%
 
41.9
%
Expected dividend yield
 
2.1
%
 
2.6
%
Risk-free interest rate
 
2.5
%
 
2.2
%
Weighted average exercise price (CAD$)
 
$
17.53

 
$
18.64

Weighted average fair value (CAD$)
 
$
5.90

 
$
5.30

Disclosure of dividends
The Company declared the following dividends for the period starting January 1, 2017 until March 12, 2019:
Declaration Date
 
Record date
 
Dividend per common share
February 20, 2019 (1)
 
March 4, 2019
 
$
0.0350

November 6, 2018
 
November 19, 2018
 
$
0.0350

August 8, 2018
 
August 20, 2018
 
$
0.0350

May 9, 2018
 
May 22, 2018
 
$
0.0350

February 20, 2018
 
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

(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, 2018, the following PSUs were outstanding:  
PSU
 
Number Outstanding
 
Fair Value
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

Granted
 
117,328

 
1,532

Paid out
 
(73,263
)
 
(1,528
)
Forfeited
 

 

Change in value
 

 
476

As at December 31, 2018
 
210,409

 
$
3,091

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, 2018, the following RSUs were outstanding:
RSU
 
Number Outstanding
 
Fair Value
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

Granted
 
244,961

 
3,207

Paid out
 
(156,715
)
 
(2,181
)
Forfeited
 
(21,436
)
 
(313
)
Change in value
 

 
(1,187
)
As at December 31, 2018
 
328,823

 
$
3,624