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Summary of Significant Accounting Policies - Benefit Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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

X

- 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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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