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BENEFIT PLANS: Amounts recognized in accumulated other comprehensive income, other postretirement plan (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure
Regulatory Assets	$ 1,653,050	$ 1,501,961
Postretirement Benefits
Defined Benefit Plan Disclosure
Net (loss) gain	(27,231)	(20,896)
Prior service cost	6,184	7,849
Subtotal	(21,047)	(13,047)
Regulatory Assets	21,047	13,047
Net amount recognized in accumulated other comprehensive income	$ 0	$ 0

X

- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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).

+ References

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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

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

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-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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