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INVESTMENTS: Investments Level 4 (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary of investments in debt and equity securities |  |  |
Equity method investment | $ 9,897 | $ 10,311 |
Investments in affordable housing | 57,286 | 29,454 |
Other Investments | 3,751 | 2,796 |
Total investments | 163,971 | 121,352 |
Earnings of unconsolidated equity-method investments | 12,426 | 11,511 | $ 11,435
Debt Securities, Held-to-Maturity, Purchase | $ (1,617) | (31,224) | 0
Idaho Power Company |  |  |
Summary of investments in debt and equity securities |  |  |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 33.00% |  |
Corporate Fixed-Income And Asset-Backed Debt Securities |  |  |
Summary of investments in debt and equity securities |  |  |
Debt Securities, Held-to-Maturity, Purchase | $ 1,600 | 31,200 |
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 3,300 | 5,000 |
Idaho Power Company |  |  |
Summary of investments in debt and equity securities |  |  |
Equity method investment | 24,078 | 14,187 |
Cash, Cash Equivalents, and Short-term Investments | 36,617 | 33,687 |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss, Noncurrent | 31,639 |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss, Current | 30,475 |  |
Executive Deferred Compensation Plan Assets | 703 | 442 |
Total investments | $ 93,037 | 78,791 |
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 33.00% |  |
Earnings of unconsolidated equity-method investments | $ 10,540 | 10,211 | 10,211
Proceeds from sales | 8,921 | 63,857 | 11,328
Gross realized gains from sales | 0 | 0 | 0
Debt Securities, Held-to-Maturity, Purchase |  | (31,224) | 0
Bridger Coal Company |  |  |
Summary of investments in debt and equity securities |  |  |
Earnings of unconsolidated equity-method investments | $ 10,540 | 10,211 | 10,211
Ida-West Energy |  |  |
Summary of investments in debt and equity securities |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 50.00% |  |
Earnings of unconsolidated equity-method investments | $ 1,886 | $ 1,300 | $ 1,224

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