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OTHER INCOME AND EXPENSE Other Income and Expense Level 4 (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of other nonoperating income (expense) [Line Items] |  |  |  |
Interest and dividend income, net |  | $ 15,266 | $ 5,952 | $ 1,408
Carrying charges on regulatory assets |  | 13,099 | 7,032 | 5,034
Net periodic benefit cost | [1] | 6,513 | 9,196 | 15,249
Income from life insurance investments |  | 8,384 | 7,107 | 5,203
Other Income |  | 6,286 | (90) | 463
Other (income) expense, net |  | 36,522 | 10,805 | (3,141)
Idaho Power Company |  |  |  |
Schedule of other nonoperating income (expense) [Line Items] |  |  |  |
Interest and dividend income, net |  | 13,410 | 4,094 | 1,241
Carrying charges on regulatory assets |  | 13,099 | 7,032 | 5,034
Net periodic benefit cost | [1] | 6,513 | 9,196 | 15,240
Income from life insurance investments |  | 8,384 | 7,012 | 5,203
Other Income |  | 6,333 | 205 | 591
Other (income) expense, net |  | $ 34,713 | $ 9,147 | $ (3,171)
[1] | The 2021 pension and postretirement non-service costs includes $4.7 million of expense for a temporary deviation from the cost-sharing provisions of the substantive postretirement plan as described in Note 11 - "Benefit Plans."

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