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Employee benefit plans (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of defined benefit plans [abstract]  
Summary of defined benefit plans
December 31, 2020December 31, 2019
Employee benefit plan expense:
Employee Benefit Plan$3,036 $2,778 
Supplemental Pension Plan(187)(61)
$2,849 $2,717 
Actuarial losses recognized in the statement of other comprehensive income (loss) in the period, before tax$(3,440)$(6,361)
Cumulative actuarial losses recognized in the statement of other comprehensive income (loss), before tax$(29,639)$(26,199)
Summary of amounts recognised in the statement of financial position for all pension plans
The amounts recognized in the consolidated statement of financial position for all pension plans are determined as follows:
December 31, 2020December 31, 2019
Employee benefit plansSERPTotalEmployee benefit plansSERPTotal
Present value of obligations$(21,974)$(2,721)$(24,695)$(20,182)$(18,366)$(38,548)
Fair value of plan assets— 8,470 8,470 1,958 24,610 26,568 
Asset (liability) on statement of financial position$(21,974)$5,749 $(16,225)$(18,224)$6,244 $(11,980)
Summary of movement in the defined benefit obligation over the year
The movement in the present value of the employee benefit obligations over the years is as follows:
20202019
Employee benefit plansSERPTotalEmployee benefit plansSERPTotal
Balance at January 1,$(20,182)$(18,366)$(38,548)$(16,239)$(37,075)$(53,314)
Current service cost(2,446)— (2,446)(2,181)(172)(2,353)
Past service cost— — — — (97)(97)
Interest cost(639)(547)(1,186)(669)(1,447)(2,116)
Actuarial gain (loss)(2,664)548 (2,116)(3,097)(4,781)(7,878)
Assets distributed on settlement3,146 14,945 18,091 — 24,430 24,430 
Benefit payments1,172 180 1,352 1,576 2,189 3,765 
Exchange gain (loss)(361)519 158 428 (1,413)(985)
Balance at December 31,$(21,974)$(2,721)$(24,695)$(20,182)$(18,366)$(38,548)
Summary of movement in the fair value of plan assets of the year
The movement in the fair value of plan assets over the years is as follows:
20202019
Employee benefit plansSERPTotalEmployee benefit plansSERPTotal
At January 1,$1,958 $24,610 $26,568 $1,864 $46,195 $48,059 
Interest income on plan assets42 736 778 72 1,809 1,881 
Actuarial gain (loss)59 (1,383)(1,324)82 1,435 1,517 
Contributions by employer1,281 — 1,281 — — — 
Assets distributed on settlement(3,141)(14,945)(18,086)— (24,430)(24,430)
Benefit payments(138)(180)(318)(152)(2,189)(2,341)
Exchange gain (loss)(61)(368)(429)92 1,790 1,882 
At December 31,$— $8,470 $8,470 $1,958 $24,610 $26,568 
Summary of amounts recognised in the statements of operations
The amounts recognized in the consolidated statements of operations are as follows:
20202019
Employee benefit plansSERPTotalEmployee benefit plansSERPTotal
Current service cost$2,446 $— $2,446 $2,181 $172 $2,353 
Interest cost639 547 1,186 669 1,447 2,116 
Past service cost— — — — 97 97 
Loss on settlement(5)— (5)— 32 32 
Expected return on plan assets(44)(734)(778)(72)(1,809)(1,881)
Employee benefit plans expense (recovery)$3,036 $(187)$2,849 $2,778 $(61)$2,717 
Summary of principal actuarial assumptions
The principal actuarial assumptions used were as follows:
20202019
Employee benefit plansSERPEmployee benefit plansSERP
GreeceTurkeyCanadaCanadaGreeceTurkeyCanadaCanada
%%%%%%%%
Expected return on plan assets— — 3.1 3.1 — — 3.9 3.9 
Discount rate - beginning of year0.9 13.0 3.1 3.1 1.7 15.0 3.9 3.9 
Discount rate - end of year0.4 12.8 — 3.1 0.9 13.0 3.1 3.1 
Rate of salary escalation1.7 8.5 — — 2.7 8.2 2.0 2.0 
Average remaining service period of active employees expected to receive benefits— — — — — — 0.6 years0.6 years
Summary of defined benefit plans' weighted average asset allocation percentages by asset category
The following table summarizes the defined benefit plans’ weighted average asset allocation percentages by asset category:
December 31, 2020December 31, 2019
Employee benefit plans (2)
SERPEmployee benefit plansSERP
Investment funds
   Money market—80 %2 %7 %
   Canadian fixed income—— %98 %— %
   Canadian equities—— %— — %
   US equities—— %— — %
   International equities—— %— — %
Other (1)
—20 %— 93 %
—100 %100 %100 %
(1)Assets held by the Canada Revenue Agency in the refundable tax account
(2)The Pension Plan was settled in September 2020
Summary of sensitivity of the overall pension obligation to changes in the weighted principal assumptions
The sensitivity of the overall pension obligation to changes in the weighted principal assumptions is:
Change in assumptionImpact on overall obligation
Discount rate
Increase by 0.5%
Decrease by $1,583
Decrease by 0.5%
Increase by $1,544
Salary escalation rate
Increase by 0.5%
Increase by $1,497
Decrease by 0.5%
Decrease by $1,558