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BENEFIT PLANS: Defined Benefit Plan, Estimated Future Benefit Payments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Pension Plan |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year One |  | $ 49,316
Defined Benefit Plan, Expected Future Benefit Payments in Year Two |  | 50,736
Defined Benefit Plan, Expected Future Benefit Payments in Year Three |  | 52,275
Defined Benefit Plan, Expected Future Benefit Payments in Year Four |  | 53,777
Defined Benefit Plan, Expected Future Benefit Payments in Year Five |  | 55,322
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter |  | 303,171
Senior Management Security Plan |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year One |  | 6,608
Defined Benefit Plan, Expected Future Benefit Payments in Year Two |  | 6,761
Defined Benefit Plan, Expected Future Benefit Payments in Year Three |  | 6,847
Defined Benefit Plan, Expected Future Benefit Payments in Year Four |  | 6,887
Defined Benefit Plan, Expected Future Benefit Payments in Year Five |  | 6,975
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter |  | $ 36,320
Forecast | Pension Plan |  |
Defined Benefit Plan Disclosure |  |
Defined Benefit Plan, Minimum Funding Requirement for Next Fiscal Year | $ 0 |

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- Definition Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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