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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 04, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Advertising expense |  | $ 14,300,000 | $ 15,200,000 | $ 15,500,000 |
Fair value of projected benefit obligations | $ 12,675,000 | $ 12,675,000 | $ 11,519,000 |  |
Stock repurchase amount authorized |  |  |  |  | $ 80,000,000
Share repurchases (in shares) | 200,410 |  |  |  |
Stock repurchased during period (in dollars per share) | $ 36.08 |  |  |  |
Common stock, par value (in dollars per share) | $ 0 | $ 0 | $ 0 |  |
Ntelos Holding, Corp | Pension Plan |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value of pension plan assets | $ 24,100,000 | $ 24,100,000 | $ 20,700,000 |  |
Fair value of projected benefit obligations | $ 30,900,000 | $ 30,900,000 | $ 25,800,000 |  |
Discount rate | 3.16% | 3.16% | 4.18% |  |
Wireless |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Advertising expense |  | $ 10,800,000 | $ 12,600,000 | $ 13,500,000 |
nTelos Pension Plan |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Pension benefits, vesting period |  | 5 years |  |  |
Vesting reductions, threshold age of recipient |  | 65 years |  |  |
Fair value of projected benefit obligations | $ 6,824,000 | $ 6,824,000 | 5,131,000 |  |
OPEB Plan |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Fair value of projected benefit obligations | $ 3,573,000 | $ 3,573,000 | $ 3,193,000 |  |
Discount rate | 3.12% | 3.12% | 4.15% |  |

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