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Acquisitions - Sprint Territory Expansion (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2018 | May 06, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Net carrying value, intangible assets | $ 52,000 |  | $ 301,554 | $ 316,504
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Additional payment for expansion of service area | $ 5,000 |  |  |
Affiliate contract expansion |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life, finite-lived intangible assets | 12 years |  |  |
Net carrying value, intangible assets | $ 45,148 |  | $ 287,475 | 304,193
Affiliate contract expansion | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life, finite-lived intangible assets |  |  | 14 years |
Prepayment of tangible assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net carrying value, intangible assets | $ 6,497 |  |  |
Off-market leases - favorable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life, finite-lived intangible assets | 16 years 6 months |  |  |
Net carrying value, intangible assets | $ 3,665 |  | $ 13,824 | $ 11,881
Off-market leases - favorable | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life, finite-lived intangible assets |  |  | 28 years |
Off-market leases - unfavorable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life, finite-lived intangible assets | 4 years 2 months 12 days |  |  |
Net carrying value, intangible assets | $ 3,310 |  |  |
Off-market leases - unfavorable | Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life, finite-lived intangible assets |  |  | 28 years |
Ntelos Holding, Corp |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payment required for the right of service | $ 52,000 | $ 255,600 |  |

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