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Investments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
SERP investments at fair value | $ 2,670 | $ 2,290 |
CoBank |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
SERP investments at fair value | 12,100 | 10,100 |
Other nonoperating income (expense) | $ 1,700 | $ 500 | $ 100
Percentage of patronage credit paid in cash | 75.00% |  |
Percentage of patronage credit paid in share | 25.00% |  |

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