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Summary of Significant Accounting Policies - Benefit Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of projected benefit obligations | $ 3,758 | $ 8,216
Postretirement medical benefits plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of projected benefit obligations | 1,869 | 3,506
Supplemental executive retirement plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of projected benefit obligations | 1,889 | 2,317
Pension plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of projected benefit obligations | $ 0 | $ 2,393

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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