Other employee benefits (Tables)

12 Months Ended

Dec. 31, 2021

Other Employee Benefits [Abstract]

Disclosure of detailed information about other employee benefit plans [Table Text Block]

		Year ended
		Dec. 31, 2021			Dec. 31, 2020
Opening defined benefit obligation	$	129,616		$	116,696
Current service cost1		3,861			4,140
Past service cost		134			-
Interest cost		3,531			3,478
Effects of movements in exchange rates		639			2,423
Remeasurement actuarial losses/(gains):
Arising from changes in demographic assumptions		2,601			(4,460	)
Arising from changes in financial assumptions		(7,309	)		10,043
Arising from experience adjustments		(1,034	)		(489	)
Benefits paid		(3,196	)		(2,215	)
Closing defined benefit obligation	$	128,843		$	129,616

Disclosure of detailed information about other employee benefit plans, balance by member group [Table Text Block]

		Dec. 31, 2021		Dec. 31, 2020
Active members	$	57,775	$	68,983
Inactive members		71,068		60,633
Closing defined benefit obligation	$	128,843	$	129,616

Disclosure of detailed information about changes in fair value of assets of other employee benefits plan [Table Text Block]

		Dec. 31, 2021			Dec. 31, 2020
Employer contributions	$	3,196		$	2,215
Benefits paid		(3,196	)		(2,215	)
Closing fair value of assets	$	-		$	-

Disclosure of detailed information about net benefit liability for other employee benefits [Table Text Block]

		Dec. 31, 2021		Dec. 31, 2020
Unfunded benefit obligation	$	128,843	$	129,616
Vacation accrual and other - non-current		3,275		3,046
Net liability	$	132,118	$	132,662

Disclosure of detailed information about other employee benefits plan [Table Text Block]

		Dec. 31, 2021		Dec. 31, 2020
Other employee benefits liability - current (note 13)	$	3,530	$	3,154
Other employee benefits liability - non-current		128,588		129,508
Net liability	$	132,118	$	132,662

Disclosure of detailed information about employee future benefit expense [Table Text Block]

		Dec. 31, 2021		Dec. 31, 2020
Current service cost 1	$	3,995	$	4,140
Net interest cost		3,531		3,478
Components recognized in consolidated income statements	$	7,526	$	7,618

Disclosure of detailed information about remeasurement of other long term employee benefits [Table Text Block]

		Dec. 31, 2021			Dec. 31, 2020
Remeasurement on the net defined benefit liability:
Actuarial losses/(gains) arising from changes in demographic assumptions	$	2,601		$	(4,460	)
Actuarial (gains)/losses arising from changes in financial assumptions		(7,309	)		10,043
Actuarial gains arising from changes experience adjustments		(1,034	)		(489	)
Components recognized in statements of comprehensive income	$	(5,742	)	$	5,094
Total other employee future benefit cost	$	1,784		$	12,712

Disclosure of detailed information about other employee benefit plan, assumptions used [Table Text Block]

	Dec. 31, 2021	Dec. 31, 2020
Defined benefit cost:
Discount rate	2.76%	3.17%
Initial weighted average health care trend rate	5.66%	5.68%
Ultimate weighted average health care trend rate	4.00%	4.00%
Average longevity at retirement age for current pensioners (years)1 :
Males	20.3	21.2
Females	23.7	23.9

	Dec. 31, 2021	Dec. 31, 2020
Defined benefit obligation:
Discount rate	3.30%	2.76%
Initial weighted average health care trend rate	6.00%	5.66%
Ultimate weighted average health care trend rate	4.00%	4.00%
Average longevity at retirement age for current pensioners (years)1 :
Males	20.4	20.3
Females	23.7	23.7
Average longevity at retirement age for current employees (future pensioners) (years)1 :
Males	22.3	22.2
Females	25.4	25.4