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Retirement Plans - AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial (loss) gain at beginning of period	$ (268,427)	$ (280,948)
Amortization of net loss (gain)	10,804	10,836
Net gain arising during the year	(6,510)	2,311
Currency translation	(111)	(626)
Net unrecognized actuarial (loss) gain at end of period	(264,244)	(268,427)
Post-Retirement Medical Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Net unrecognized actuarial (loss) gain at beginning of period	152	304
Amortization of net loss (gain)	$ (152)	(152)
Net unrecognized actuarial (loss) gain at end of period		$ 152

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- Definition

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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