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Employee benefit plans (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of defined benefit plans [abstract]  
Summary of defined benefit plans
December 31, 2021December 31, 2020
Employee benefit plan expense:
Employee Benefit Plans$2,317 $3,036 
Supplemental Pension Plan— (187)
$2,317 $2,849 
Actuarial losses recognized in the statement of other comprehensive income (loss) in the year, before tax$(115)$(3,440)
Cumulative actuarial losses recognized in the statement of other comprehensive income (loss), before tax$(29,754)$(29,639)
Summary of amounts recognised in the statement of financial position for all pension plans
The amounts recognized in the consolidated statement of financial position for all pension plans are determined as follows:
December 31, 2021December 31, 2020
Employee benefit plansEmployee benefit plansSERPTotal
Present value of obligations$(8,942)$(11,109)$(2,721)$(13,830)
Fair value of plan assets— — 8,470 8,470 
Asset (liability) on statement of financial position$(8,942)$(11,109)$5,749 $(5,360)
Summary of movement in the defined benefit obligation over the year
The movement in the present value of the employee benefit obligations over the years is as follows:
20212020
Employee benefit plansSERPTotalEmployee benefit plansSERPTotal
Balance at January 1,$(11,109)$(2,721)$(13,830)$(9,317)$(18,366)$(27,683)
Current service cost(2,070)— (2,070)(2,446)— (2,446)
Past service cost113 — 113 — — — 
Interest cost(549)— (549)(639)(547)(1,186)
Actuarial (loss) gain(115)— (115)(2,664)548 (2,116)
Assets distributed on settlement (1)
— — — 3,146 14,945 18,091 
Benefit payments1,049 2,740 3,789 1,172 180 1,352 
Exchange gain (loss)3,739 (19)3,720 (361)519 158 
Balance at December 31,$(8,942)$— $(8,942)$(11,109)$(2,721)$(13,830)
(1)Assets distributed on settlement are related to the wind-up and settlement of the registered pension plans and supplemental pension plans in Canada.
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:
20212020
SERPEmployee benefit plansSERPTotal
At January 1,$8,470 $1,958 $24,610 $26,568 
Interest income on plan assets— 42 736 778 
Actuarial gain (loss)— 59 (1,383)(1,324)
Contributions by employer— 1,281 — 1,281 
Assets distributed on settlement (2)
(8,470)(3,141)(14,945)(18,086)
Benefit payments— (138)(180)(318)
Exchange loss— (61)(368)(429)
At December 31,$— $— $8,470 $8,470 
(2)Assets distributed on settlement are related to the wind-up and settlement of the registered pension plans and supplemental pension plans in Canada.
Summary of principal actuarial assumptions
The principal actuarial assumptions used were as follows:
20212020
Employee benefit plansEmployee benefit plansSERP
GreeceTurkeyGreeceTurkeyCanadaCanada
%%%%%%
Expected return on plan assets— — — — 3.1 3.1 
Discount rate - beginning of year0.4 12.8 0.9 13.0 3.1 3.1 
Discount rate - end of year1.0 19.0 0.4 12.8 — 3.1 
Rate of salary escalation1.7 15.0 1.7 8.5 — — 
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 $166
Decrease by 0.5%
Increase by $199
Salary escalation rate
Increase by 0.5%
Increase by $194
Decrease by 0.5%
Decrease by $163