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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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