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Acquisitions - Narrative (Details) customer in Thousands, $ in Thousands |  |  | 12 Months Ended | 32 Months Ended
--- | --- | --- | --- | ---
Apr. 06, 2017 USD ($) customer | May 06, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Waived management fees, included in affiliate contract expanse accumulated amortization |  |  | $ 37,800 | $ 36,100 | $ 24,600 | $ 98,400
Acquisition, integration and migration expenses |  |  | 0 | 11,030 | 42,232 |
Ntelos Holding, Corp |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price |  | $ 667,800 |  |  |  |
Acquisition, integration and migration expenses |  | $ 75,700 |  | 17,500 | 54,700 |
Debt issuance costs |  |  | $ 23,000 |  |  | $ 23,000
Ntelos Holding, Corp | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Before amendment right or obligation to sell business |  | 80.00% |  |  |  |
Ntelos Holding, Corp | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
After amendment right or obligation to sell business |  | 90.00% |  |  |  |
Management fee charge by Sprint |  | $ 4,200 |  |  |  |
Parkersburg Expansion Area |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Aggregate purchase price | $ 6,000 |  |  |  |  |
Number of customers | customer | 25 |  |  |  |  |
Affiliated Entity |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Waived management fees, included in affiliate contract expanse accumulated amortization |  | 255,600 |  |  |  |
Affiliated Entity | Nonmonetary Exchange of Intangibles | Licensing Agreements |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Related party transaction |  | 198,200 |  |  |  |
Affiliated Entity | Nonmonetary Exchange of Intangibles | Additional Customer Based Contract Rights |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Related party transaction |  | 205,900 |  |  |  |
Affiliated Entity | Nonmonetary Exchange of Intangibles | Affiliate Contract Agreement |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Related party transaction |  | $ 405,000 |  |  |  |
Cost of Goods and Services Sold | Ntelos Holding, Corp |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, integration and migration expenses |  |  |  | 1,800 | 1,300 |
Selling, General and Administrative | Ntelos Holding, Corp |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition, integration and migration expenses |  |  |  | $ 4,700 | $ 11,100 |

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