Acquisitions - Schedule of Acquisition Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Integration and acquisition expenses	$ 1,706	$ 15,272	$ 9,873	$ 35,801
Ntelos Holding, Corp
Business Acquisition [Line Items]
Integration and acquisition expenses	2,900	20,200	15,400	43,900
Ntelos Holding, Corp | Cost of goods and services
Business Acquisition [Line Items]
Integration and acquisition expenses	100	700	300	1,000
Ntelos Holding, Corp | Selling, general and administrative
Business Acquisition [Line Items]
Integration and acquisition expenses	1,100	4,200	5,200	7,100
Ntelos Holding, Corp | Integration and acquisition
Business Acquisition [Line Items]
Integration and acquisition expenses	$ 1,700	$ 15,300	$ 9,900	$ 35,800