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Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value	$ 2,255		$ 2,255		$ 2,278
Valley Network Partnership
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage	20.00%		20.00%
CoBank
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value	$ 9,500		$ 9,500		$ 8,700
Other nonoperating income (expense)	1,000	$ 900	3,000	$ 2,700
Percentage of patronage credit paid in cash		75.00%		75.00%
Percentage of patronage credit paid in share		25.00%		25.00%
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	200	$ 200	700	$ 700
Related party costs	$ 700	$ 800	$ 2,200	$ 2,400

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Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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