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Investments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
SERP investments, current | $ 0 | $ 801,000 |
SERP investments at fair value | 1,889,000 | 2,317,000 |
CoBank |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
SERP investments at fair value | 10,000,000 | 10,300,000 |
Other nonoperating income (expense) | $ 70,700 | 2,000,000 | $ 4,200,000
Percentage of patronage credit paid in cash | 75.00% |  |
Percentage of patronage credit paid in share | 25.00% |  |
Valley Network Partnership |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest, percentage | 20.00% |  |
Equity Method Investee |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue from related parties | $ 700,000 | 700,000 | 900,000
Related party costs | $ 100,000 | $ 1,200,000 | $ 2,700,000

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