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Share-Based Compensation And Other Related Information (Tables)
 12 Months Ended
Dec. 31, 2021
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, 20191,143,348 $33.84 
Granted7,605 $39.48 
Exercised(329,711)$19.23 
Expired(482,438)$53.41 
Forfeited(21,387)$43.08 
As at December 31, 2020317,417 $18.78 
Granted53,115 30.70 
Exercised(65,780)$11.77 
Expired(2,162)41.62 
Forfeited(23,587)$32.27 
As at December 31, 2021279,003 $21.38 
Disclosure of range of exercise prices of outstanding share options
The following table summarizes information about the Company's stock options outstanding at December 31, 2021:
 Options OutstandingOptions Exercisable
Range of Exercise
Prices
CAD$
Number Outstanding as at December 31, 2021Weighted Average
Remaining
Contractual Life
(years)		Weighted
Average
Exercise Price
CAD$		Number Outstanding as at December 31, 2021Weighted
Average
Exercise
Price CAD$
$9.76 - $17.1148,458 0.9 $11.59 48,458 $11.59 
$17.12 - $24.46143,896 3.4 $18.90 143,896 $18.90 
$24.47 - $31.8174,720 6.4 $29.50 21,605 $26.54 
$31.82 - $41.6211,929 3.9 $40.26 8,128 $40.62 
 279,003 3.8 $21.38 222,087 $18.84 
Disclosure of assumptions used in determining fair value of options granted
The following assumptions were used in the Black-Scholes option pricing model in determining the fair value of options granted during the years ended December 31:
20212020
Expected life4.0 4.0 
Expected volatility44.0 %37.9 %
Expected dividend yield2.4 %1.1 %
Risk-free interest rate1.9 %0.8 %
Weighted average exercise price (CAD$)$30.70 $39.45 
Weighted average fair value (CAD$)$9.39 $15.80 
Disclosure of dividends
The Company declared the following dividends for the years ended December 31, 2021 and 2020:
Declaration dateRecord dateDividend per common share
February 23, 2022 (1)
March 7, 2022$0.12 
November 9, 2021November 22, 2021$0.10 
August 10, 2021August 23, 2021$0.10 
May 12, 2021May 25, 2021$0.07 
February 17, 2021March 1, 2021$0.07 
November 4, 2020November 16, 2020$0.07 
August 5, 2020August 17, 2020$0.05 
May 6, 2020May 19, 2020$0.05 
February 19, 2020March 2, 2020$0.05 
(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, 2021, the following PSUs were outstanding:  
PSUNumber OutstandingFair Value
As at December 31, 2019247,601 $5,896 
Granted62,920 1,942 
Paid out(54,962)(2,626)
Change in value— 3,658 
As at December 31, 2020255,559 $8,870 
Granted79,417 2,049 
Paid out(117,328)(4,539)
Forfeited— — 
Change in value— (901)
As at December 31, 2021217,648 $5,479 
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, 2021, the following RSUs were outstanding:
RSUNumber OutstandingFair Value
As at December 31, 2019299,216 $7,107 
Granted261,224 6,302 
Paid out(148,049)(4,762)
Forfeited(15,819)(545)
Change in value— 5,628 
As at December 31, 2020396,572 $13,730 
Granted240,366 5,818 
Paid out(197,320)(4,829)
Forfeited(13,218)(329)
Change in value— (3,699)
As at December 31, 2021426,400 $10,691