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Investments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |
SERP Investments at fair value | $ 2,278 | $ 1,779 |
Virginia Independent Telephone Alliance |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest, percentage | 23.20% |  |
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 | $ 8,700 | 7,700 |
Other nonoperating income (expense) |  | 4,200 | $ 2,800
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 | $ 1,000 | 1,700 | 2,200
Related party costs | $ 3,000 | $ 3,400 | $ 3,700

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