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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
Share-Based Payment Arrangements [Abstract]  
Non-cash employee compensation expenses recognized in general and administrative expense in the Statements of Operations and Comprehensive Income
Share-based compensation expenses recognized in the consolidated statements of operations include the following components:
For the Years Ended December 31,
 20202019
Stock options438 1,890 
Deferred share units518 689 
Share appreciation rights35 (52)
Performance and restricted share units394 592 
UK performance share units1,610 — 
2,995 3,119 
Fair value assumptions estimated at the grant dates using the Black-Scholes option-pricing model Fair values of stock options granted during the year ended December 31, 2020 and 2019 were based on the weighted average assumptions noted in the following table:
For the Years Ended
December 31,
 20202019
Expected volatility56.69%51.20%
Risk-free interest rate1.41%1.73%
Expected lives1.1 years5.7 years
Schedule of number and weighted average remaining contractual life of outstanding share options
A summary of stock option activity under the Company's Stock Option Plan during the year ended December 31, 2020 is as follows: 
Options




('000)		Weighted–
average
exercise
price

(CAD$)		Weighted–
average
remaining
contractual
life 
(Years)
Outstanding as of December 31, 20183,498 5.28 6.3
Granted806 5.21 9.2
Exercised(438)3.82 7.3
Forfeited(35)5.49 7.7
Expired(55)8.50 0
Outstanding as of December 31, 20193,776 5.39 4.7
Granted57 3.99 9.2
Exercised(1,712)3.68 6.0
Forfeited(574)6.03 4.0
Expired(698)7.94 0
Outstanding as of December 31, 2020849 6.21 5.3
Exercisable as of December 31, 20193,320 5.41 4.1
Exercisable as of December 31, 2020711 6.40 4.7
Schedule of range of exercise prices of outstanding share options
The number of stock options outstanding by strike price as of December 31, 2020 is shown in the following table:
Options outstandingOptions exercisable
Number outstanding at December 31, 2020Weighted-average remaining contractual lifeWeighted-average exercise priceNumber outstanding at December 31, 2020Weighted-average exercise price
Range of exercise price (CAD$)('000)(Years)(CAD$)('000)(CAD$)
3.51 to 4.50
137 3.14.31 131 4.32 
4.51 to 5.50
432 7.75.14 306 5.09 
5.51 to 7.50
116 4.26.41 110 6.46 
7.51 to 10.50
121 1.89.36 121 9.36 
10.51 to 14.15
43 0.313.59 43 13.59 
849 5.36.21 711 6.40 
The number of stock options outstanding by strike price as of December 31, 2019 is shown in the following table:
Options outstandingOptions exercisable
Number outstanding at December 31, 2019Weighted-average remaining contractual lifeWeighted-average exercise priceNumber outstanding at December 31, 2019Weighted-average exercise price
Range of exercise price (CAD$)('000)(Years)(CAD$)('000)(CAD$)
1.50 to 2.50
581 3.71.90 581 1.90 
2.51 to 3.50
373 5.72.82 373 2.82 
3.51 to 4.50
605 3.04.34 588 4.35 
4.51 to 5.50
1,187 7.35.03 782 4.96 
5.51 to 7.50
482 4.66.46 448 6.47 
7.51 to 10.50
322 2.09.67 322 9.67 
10.51 to 17.65
226 0.614.92 226 14.92 
3,776 4.75.39 3,320 5.41 
Summary of other equity activity
The DSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of DSUs, beginning of period ('000)1,274 1,086 
Granted214 188 
Exercised(136)— 
Forfeited(30)— 
Number of DSUs, end of period ('000)1,322 1,274 
The SARs activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of SARs, beginning of period ('000)593 674 
Granted240 285 
Exercised(225)(203)
Forfeited(57)(160)
Expired(113)(3)
Number of SARs, end of period ('000)438 593 
The PRSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of PRSUs, beginning of period ('000)634 791 
Granted— 561 
Settled(95)(324)
Forfeited(329)(394)
Number of PRSUs, end of period ('000)210 634 
A summary of the PSU activity during the year ended December 31, 2020 and 2019:
For the Years Ended December 31,
20202019
Number of PSUs, beginning of period ('000)— 1,173 
Settled— (1,173)
Number of PSUs, end of period ('000)— — 
The UK PSU activity during the year ended December 31, 2020 and 2019 can be summarized as follows:
For the Years Ended
December 31,
20202019
Number of UK PSUs, beginning of period ('000)— — 
Granted1,555 — 
Settled— — 
Forfeited— — 
Number of UK PSUs, end of period ('000)1,555 —