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Share-based compensation plans (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]  
Schedule of number of stock options and weighted avearge exercisable price
(Number of options)20192018
Beginning of year8,820,8058,324,666
Options granted886,7401,473,430
Options forfeited(270,025)(315,340)
Options expired(815,423)(661,951)
Options exercised [note 16](5,000)-
End of year8,617,0978,820,805
Exercisable6,290,3806,007,557

Weighted average exercise prices were as follows:
20192018
Beginning of year$19.75$22.19
Options granted15.2711.32
Options forfeited22.5925.43
Options expired38.4328.90
Options exercised 16.38-
End of year$17.44$19.75
Exercisable$18.90$22.83
Total options outstanding and exercisable
Total options outstanding and exercisable at December 31, 2019 were as follows:
Options outstandingOptions exercisable
Option price per shareNumberWeighted average remaining lifeWeighted average exercisable priceNumberWeighted average exercisable price
$11.32 - 15.833,733,2105.7$13.501,406,493$13.52
$15.84 - 26.814,883,8871.9$20.454,883,887$20.45
8,617,0976,290,380
The foregoing options have expiry dates ranging from May 14, 2020 to February 28, 2027.
Compensation expense under equity settled plans
20192018
Stock option plan$4,418$4,744
Performance share unit plan(a)7,2457,690
Restricted share unit plan2,6792,542
Employee share ownership plan3,1273,845
Total$17,469$18,821

(a) In the fourth quarter, the performance share unit plan was amended to allow eligible participants to elect payout of their grants in cash or shares, provided they have met their share ownership requirements. As a result, this plan is now considered cash-settled. This amount represents the expense recorded prior to the plan modification.
Expenses (recoveries) cash-settled plans
20192018
Deferred share unit plan$(1,001)$2,922
Performance share unit plan(a)--
Phantom stock option plan(436)675
Total$(1,437)$3,597

(a) The modification to the PSU plan resulted in a reclassification, at the date of modification, of $8,369,000 from equity to liabilities. The liability recognized on the date of the modification was less than the amount previously recognized as an increase in equity. Since the plan modification did not change the performance and vesting criteria, no incremental fair value was granted.
Equity-settled plan [Member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Inputs measurement fair value of sharebased plans
Stock option planPSURSU
Number of options granted886,740477,250212,496
Expected vesting-106%-
Average strike price$15.27-$15.33
Expected dividend$0.08--
Expected volatility36%38%-
Risk-free interest rate1.8%1.8%-
Expected life of option4.9 years3.0 years-
Expected forfeitures7%12%15%
Weighted average grant date fair values$4.92$15.33$15.33
Phantom Stock Option Plan [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Inputs measurement fair value of sharebased plans
PSUsPhantom stock options
Grant dateReporting dateGrant dateReporting date
Mar 1, 2019Dec 31, 2019Mar 1, 2019Dec 31, 2019
Number of units477,2501,465,61868,890406,720
Expected vesting106%80%--
Average strike price--$15.27$16.48
Expected dividend--$0.08$0.08
Expected volatility38%31%37%35%
Risk-free interest rate1.8%1.7%1.5%1.7%
Expected life of option3.0 years1.4 years4.5 years4.0 years
Expected forfeitures12%10%8%8%
Weighted average measurement date fair values$15.33$10.07$5.07$2.14