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Retirement Plans - AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2018
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial (loss) gain at beginning of period		$ (268,427)
Amortization of net loss (gain)	$ 10,455	10,804
Net gain arising during the year	4,939	(6,510)
Currency translation	(2,779)	(111)
Net unrecognized actuarial (loss) gain at end of period	(251,629)	(264,244)
Post-Retirement Medical Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial (loss) gain at beginning of period	0	152
Amortization of net loss (gain)	$ 0	$ (152)

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Defined Benefit Plan, Amounts Recognized In Other Comprehensive Income (Loss), Currency Translation

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

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) 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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