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Summary of Significant Accounting Policies - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Feb. 01, 2018 | Dec. 31, 2018 USD ($) plan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 shares | Dec. 31, 2005 shares
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment of intangible assets, finite-lived |  | $ 0 | $ 0 |  |  |
Impairment charges on long-lived assets |  | 0 | 0 | $ 0 |  |
Advertising expense |  | 15,200,000 | 15,500,000 | 12,200,000 |  |
Net benefit from retirement plans |  | $ 1,688,000 | 1,388,000 | $ 4,396,000 |  |
Number of stock incentive plans | plan |  | 2 |  |  |  |
Affiliate contract expansion |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets | 12 years |  |  |  |  |
Affiliate contract expansion | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 4 years |  |  |  |
Affiliate contract expansion | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 14 years |  |  |  |
Off-market leases - favorable |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets | 16 years 6 months |  |  |  |  |
Off-market leases - favorable | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 1 year |  |  |  |
Off-market leases - favorable | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 28 years |  |  |  |
Off-market leases - unfavorable |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets | 4 years 2 months 12 days |  |  |  |  |
Off-market leases - unfavorable | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 1 year |  |  |  |
Off-market leases - unfavorable | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 28 years |  |  |  |
Acquired subscribers - Cable | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 3 years |  |  |  |
Acquired subscribers - Cable | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 10 years |  |  |  |
Other intangibles | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 15 years |  |  |  |
Other intangibles | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life, finite-lived intangible assets |  | 20 years |  |  |  |
Ntelos Holding, Corp | Pension Plan |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Fair value of pension plan assets |  | $ 20,700,000 | 22,600,000 |  |  |
Fair value of projected benefit obligations |  | 25,800,000 | 28,200,000 |  |  |
Funded status of retirement plans |  | 5,100,000 | 5,600,000 |  |  |
Non Vested Shares |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Compensation, nonvested awards, compensation cost not yet recognized |  | $ 2,700,000 | $ 2,500,000 |  |  |
Compensation, nonvested awards, cost not yet recognized, period for recognition |  | 2 years 9 months 18 days |  |  |  |
The 2005 Plan |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | shares |  |  |  |  |  | 2,880,000
Award term for authorization of grants |  |  |  |  |  | 10 years
The 2014 Plan |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Additional number of shares authorized for issuance (in shares) | shares |  |  |  |  | 3,000,000 |
Management Shares | The 2014 Plan | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Award term for authorization of grants |  |  |  |  | 10 years |

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