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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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