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Investments - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
SERP Investments at fair value | $ 1,706 |  | $ 2,278
Valley Network Partnership |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest, percentage | 20.00% |  |
CoBank |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
SERP Investments at fair value | $ 9,000 |  | $ 8,700
Other nonoperating income (expense) | 1,000 | $ 900 |
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 | 200 |  |
Related party costs | $ 800 | $ 700 |

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