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Employee benefits - Change in accumulated other comprehensive income loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Amount recognized in AOCL at beginning of year	$ 243,434	$ 225,356
Recognized during the year:
Amortization of actuarial losses	(21,465)	(15,644)	$ (18,876)
Ocurring during the year:
Net actuarial (gains) / losses	(21,875)	33,722
Total (decrease) increase in AOCL	(43,340)	18,078
Accumulated other comprehensive loss at end of year	200,094	243,434	225,356
OPEB Plan
Defined Benefit Plan Disclosure [Line Items]
Amount recognized in AOCL at beginning of year	(26,486)	12,993
Recognized during the year:
Amortization of actuarial losses	2,212	0	(1,873)
Ocurring during the year:
Net actuarial (gains) / losses	(1,180)	(39,479)
Total (decrease) increase in AOCL	1,032	(39,479)
Accumulated other comprehensive loss at end of year	$ (25,454)	$ (26,486)	$ 12,993

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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