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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |
Loss on investments carried at fair value | $ 0.2 |  |
Gain on investments carried at fair value |  | $ 0.5 | $ 0.1
Increase in investments carried at cost | $ 0.9 | $ 0.7 |
Virginia Independent Telephone Alliance |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest, percentage | 23.00% |  |
Valley Network Partnership |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership interest, percentage | 20.00% |  |

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