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Employee Benefit Plans: Accumulated Benefit Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 350,187 | $ 466,505
Supplemental Employee Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 45,225 | 55,260
Other Postretirement Benefits Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 49,725 | $ 63,484

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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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. + Details
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