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Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
SERP investments	$ 862		$ 862		$ 0
SERP Investments at fair value	2,165		2,165		2,687
CoBank
Schedule of Equity Method Investments [Line Items]
SERP Investments at fair value	10,100		10,100		$ 9,800
Other nonoperating income (expense)	$ 500	$ 1,000	$ 1,500	$ 3,000
Percentage of patronage credit paid in cash	75.00%		75.00%
Percentage of patronage credit paid in share	25.00%		25.00%
Valley Network Partnership
Schedule of Equity Method Investments [Line Items]
Ownership interest, percentage	20.00%		20.00%
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenue from related parties	$ 200		$ 500	700
Related party costs	$ 30	$ 700	$ 1,100	$ 2,200

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