BENEFIT PLANS: Defined Benefit Plan, Estimated Future Benefit Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
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

The minimum funding requirement for next fiscal year for defined benefit pension plan.

No definition available.

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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.

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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

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- Definition

Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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