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Retirement Plans - AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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