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Share-based compensation plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Abstract]  
Schedule of number of stock options and weighted avearge exercisable price
(Number of options)20182017
Beginning of year8,324,6668,020,311
Options granted1,473,4301,373,040
Options forfeited(315,340)(564,423)
Options expired(661,951)(504,052)
Options exercised [note 16]-(210)
End of year8,820,8058,324,666
Exercisable6,007,5575,809,077

Weighted average exercise prices were as follows:
20182017
Beginning of year$22.19$23.61
Options granted11.3214.70
Options forfeited25.4326.49
Options expired28.9019.50
Options exercised -19.37
End of year$19.75$22.19
Exercisable$22.83$24.95
Total options outstanding and exercisable
Total options outstanding and exercisable at December 31, 2018 were as follows:
Options outstandingOptions exercisable
Option price per shareNumberWeighted average remaining lifeWeighted average exercisable priceNumberWeighted average exercisable price
$11.32 - 17.844,119,8105.8$14.011,306,562$15.79
$17.85 - 39.534,700,9952$24.794,700,995$24.79
8,820,8056,007,557
The foregoing options have expiry dates ranging from February 28, 2019 to February 28, 2026.
Compensation expense under equity settled plans
20182017
Stock option plan$4,744$4,941
Performance share unit plan7,6906,186
Restricted share unit plan2,5422,833
Employee share ownership plan3,8454,473
Total$18,821$18,433
Expenses (recoveries) cash-settled plans
20182017
Deferred share unit plan$2,922$(42)
Phantom stock option plan675176
Total$3,597$134
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 granted1,473,430602,530377,021
Average strike price$11.32-$11.46
Expected dividend$0.08--
Expected volatility35%37%-
Risk-free interest rate2.0%1.9%-
Expected life of option4.8 years3 years-
Expected forfeitures7%9%13%
Weighted average grant date fair values$3.48$11.43$11.46
Phantom Stock Option Plan [member]  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Inputs measurement fair value of sharebased plans
Grant dateReporting date
March 1, 2018December 31, 2018
Number of units101,895353,580
Average strike price$11.32$17.74
Expected dividend$0.08$0.08
Expected volatility35%37%
Risk-free interest rate1.9%1.9%
Expected life of option4.5 years3.7 years
Expected forfeitures7%8%
Weighted average measurement date fair values$3.68$4.21