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Employee benefit plans - Amounts Recognized in Other Comprehensive Loss/(Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Plans
Adjustments arising during the period:
Net actuarial loss/(gain)	$ (63,684)	$ 12,452	$ 146,414
Prior service cost/(credit)	837	1,229	1,667
Net settlements/curtailments	(550,706)	(886)	(2,377)
Reversal of amortization:
Net actuarial (loss)/gain	(16,503)	(28,833)	(30,681)
Prior service (cost)/credit	(900)	(1,006)	(1,022)
Total recognized in other comprehensive loss/(income)	(630,956)	(17,044)	114,001
Total recognized in net periodic benefit cost and other comprehensive loss/(income)	(57,633)	18,214	144,254
Retiree Health and Life Insurance Plans
Adjustments arising during the period:
Net actuarial loss/(gain)	(412)	(468)	(914)
Prior service cost/(credit)	0	0	0
Net settlements/curtailments	0	0	0
Reversal of amortization:
Net actuarial (loss)/gain	744	834	823
Prior service (cost)/credit	0	279	498
Total recognized in other comprehensive loss/(income)	332	645	407
Total recognized in net periodic benefit cost and other comprehensive loss/(income)	$ (285)	$ (145)	$ (857)

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- Definition

Projected defined benefit plan amortization of gains losses.

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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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 of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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