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Share-based compensation (Tables)
12 Months Ended
Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of fair value assumptions used in the Black Scholes valuation of share options [Table Text Block]
For options granted during the year ended   Dec. 31, 2020  
Weighted average share price at grant date (CAD) $ 3.77  
Risk-free rate   1.14%  
Expected dividend yield   0.5%  
Expected stock price volatility (based on historical volatility)   57.0%  
Expected life of option (months)   84  
Weighted average per share fair value of stock options granted (CAD) $ 2.02  
Disclosure of range of exercise prices of outstanding share options [Table Text Block]

Dec. 31, 2020

Range of
exercise prices
C$

Number of
options
outstanding

Weighted
average
remaining
contractual life
(years)

Weighted
average
exercise price
C$

Number of
options
exercisable

Weighted
average share
price at
exercise date
C$

$3.76 - $3.92

1,563,189

 

6.16

 

$

3.77

 

 

$

 

Disclosure of number and weighted average exercise prices of share options [Table Text Block]
    Year ended     Year ended  
    Dec. 31, 2020     Dec. 31, 2019  
   

Number of

shares

subject to

option

   

Weighted-

average

exercise price

C$

   

Number of

shares subject

to option

   

Weighted

average

exercise price

C$

 
Balance, beginning of year      

      $  
Number of units granted during the year   1,581,385   $ 3.77       $  
Forfeited   (18,196 ) $ 3.76       $  
Balance, end of year   1,563,189   $ 3.77       $  
Deferred Share Unit [Member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of detailed information about number and weighted average exercise prices of other equity instruments [Table Text Block]
    Year ended  
    Dec. 31, 2020     Dec. 31, 2019  
Granted during the year:            
Number of units   465,889     337,999  
Weighted average price (C$/unit) $ 4.10   $ 5.89  
Expenses recognized during the year1 (notes 6c) $ 5,149   $ 1,157  
Payments made during the year (note 19) $ 497   $ 1,668  

 

1 This expense relates to the grant of DSUs, as well as mark-to-market adjustments, and is presented within selling and administrative expenses on the consolidated income statements.

Restricted Share Unit [Member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of detailed information about number and weighted average exercise prices of other equity instruments [Table Text Block]
    Year ended  
    Dec. 31, 2020     Dec. 31, 2019  
Number of units, beginning of year 1   2,223,999     3,666,867  
Number of units granted during the year   1,388,786     1,080,741  
Credits for dividends   17,587     7,554  
Number of units forfeited during the year   (44,678 )   (573,914 )
Number of units vested   (645,357 )   (1,957,249 )
Number of units, end of year1   2,940,337     2,223,999  
Weighted average price - granted (C$/unit) $ 3.98   $ 8.98  
Expenses recognized during the year2 (note 6c) $ 6,750   $ 1,557  
Payments made during the year (note 19) $ 2,646   $ 9,380  
Performance Share Unit [Member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Disclosure of detailed information about number and weighted average exercise prices of other equity instruments [Table Text Block]
    Year ended  
    Dec. 31, 2020     Dec. 31, 2019  
Number of units, beginning of year        
Number of units granted during the year   1,089,569      
Credits for dividends   6,046      
Number of units, end of year   1,095,615      
Weighted average price - granted (C$/unit) $ 3.97   $
Expenses recognized during the year (note 6c) $ 1,987   $  
Payments made during the year (note 19) $   $