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BENEFIT PLANS: Amounts recognized in accumulated other comprehensive income, other postretirement plan (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure
Regulatory Assets	$ 1,564,458	$ 1,507,372
Postretirement Benefits
Defined Benefit Plan Disclosure
Net (loss) gain	(28,207)	(29,353)
Prior service cost	3,262	4,636
Subtotal	(24,945)	(24,717)
Regulatory Assets	24,945	24,717
Net amount recognized in accumulated other comprehensive income	$ 0	$ 0

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Amount is prior to the recording of a regulatory asset.

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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