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Investments - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]
SERP investments at fair value	$ 2,096		$ 2,096		$ 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	$ 9,200		$ 9,200		$ 8,700
Other nonoperating income (expense)	1,000	$ 900	2,000	$ 1,800
Percentage of patronage credit paid in cash						75.00%
Percentage of patronage credit paid in share						25.00%
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenue from related parties		300		500
Related party costs	$ 600	$ 800	$ 1,400	$ 1,500

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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).

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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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