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Pension and other post-retirement benefits (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Of Defined Benefit Plans [Abstract]  
Information related to defined benefit plan
Pension benefit plansOther benefit plans
2020201920202019
Fair value of plan assets, beginning of year$6,806$7,177$-$-
Interest income on plan assets197262--
Return on assets excluding interest income130280--
Benefits paid(915)(912)--
Administrative costs paid(1)(1)--
Fair value of plan assets, end of year$6,217$6,806$-$-
Defined benefit obligation, beginning of year$62,588$54,271$24,955$21,161
Current service cost1,9771,5861,010817
Interest cost1,6731,807792841
Actuarial loss (gain) arising from:
- demographic assumptions--102-
- financial assumptions6,3236,9252,0132,877
- experience adjustment350777(2,236)114
Benefits paid(1,765)(1,705)(809)(855)
Foreign exchange973(1,073)--
Defined benefit obligation, end of year$72,119$62,588$25,827$24,955
Defined benefit liability [note 14]$(65,902)$(55,782)$(25,827)$(24,955)
Percentages of the total fair value of assets pension plan
Pension benefit plans
20202019
Asset category(a)
Canadian equity securities8%9%
U.S. equity securities12%12%
Global equity securities8%9%
Canadian fixed income31%30%
Other(b)41%40%
Total100%100%

(a) The defined benefit plan assets contain no material amounts of related party assets at December 31, 2020 and 2019 respectively.

(b) Relates mainly to the value of the refundable tax account held by the Canada Revenue Agency. The refundable total is approximately equal to half of the sum of the realized investment income plus employer contributions less half of the benefits paid by the plan.
Components of net pension and other benefit expense
The following represents the components of net pension and other benefit expense included primarily as part of
administration:
Pension benefit plansOther benefit plans
2020201920202019
Current service cost$1,977$1,586$1,010$817
Net interest cost1,4761,545792841
Administration cost11--
Defined benefit expense [note 18]3,4543,1321,8021,658
Defined contribution pension expense [note 18]12,41011,767--
Net pension and other benefit expense$15,864$14,899$1,802$1,658
Amount of actuarial losses (gains) recognized in other comprehensive income
The total amount of actuarial losses (gains) recognized in other comprehensive income is:
Pension benefit plansOther benefit plans
2020201920202019
Actuarial loss (gain)$6,673$7,702$(121)$2,991
Return on plan assets excluding
interest income(130)(280)--
$6,543$7,422$(121)$2,991
Defined benefit obligation and net pension and other benefit expense [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Assumptions to determine defined benefit obligations and expense
The assumptions used to determine the Company’s defined benefit obligation and net pension and other benefit expense
were as follows at December 31 (expressed as weighted averages):
Pension benefit plansOther benefit plans
2020201920202019
Discount rate - obligation2.4%3.0%2.5%3.1%
Discount rate - expense3.0%3.7%3.1%3.9%
Rate of compensation increase2.9%3.0%--
Initial health care cost trend rate--5.0%6.0%
Cost trend rate declines to--5.0%5.0%
Year the rate reaches its final level--20212022
Dental care cost trend rate--4.5%5.0%
1% Change in assumptions [member] | Defined benefit obligation and net pension and other benefit expense [Member]  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Assumptions to determine defined benefit obligations and expense
A 1% change at the reporting date to one of the relevant actuarial assumptions, holding other assumptions constant, would
have affected the defined benefit obligation by the following:
Pension benefit plansOther benefit plans
IncreaseDecreaseIncreaseDecrease
Discount rate $(9,778)$12,766$(3,270)$4,138
Rate of compensation increase3,009(2,772)n/an/a
A 1% change in any of the other assumptions would not have a significant impact on the defined benefit obligation.