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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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