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Investments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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