Long-Term Debt - Narrative (Details)		1 Months Ended		12 Months Ended
	Dec. 18, 2015 USD ($) facility	Jan. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Number of credit facilities | facility	3
Total debt, net of unamortized loan fees				$ 821,958,000	$ 829,265,000
Unamortized loan fees				$ 14,542,000	18,610,000
Weighted average interest rate				4.23%
Variable swap rate	50.00%
Total leverage ratio through December 30, 2019	3.25
Total leverage ratio thereafter	3.00
Debt service coverage ratio, actual				3.73
Minimum liquidity balance	$ 25,000,000			$ 25,000,000
Derivative asset, fair value				13,200,000	$ 11,200,000
Accrued in anticipation of early distribution of patronage credit				$ 2,800,000
Percentage of patronage credit paid in cash				75.00%
Percentage of patronage credit paid in shares				25.00%
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Fixed interest rate	1.16%
Maximum [Member]
Debt Instrument [Line Items]
Total leverage ratio from closing date through December 30, 2018	3.75
Minimum [Member]
Debt Instrument [Line Items]
Debt service coverage ratio, actual	2.00
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Term of credit facility	5 years
Maximum borrowing capacity	$ 75,000,000
Proceeds from line of credit				$ 0
Incremental Term Loan Facility [Member]
Debt Instrument [Line Items]
Number of credit facilities | facility	1
Maximum borrowing capacity	$ 150,000,000
Term loan A-1 [Member]
Debt Instrument [Line Items]
Term of credit facility	5 years
Maximum borrowing capacity	$ 485,000,000
Quarterly principal payment period one				6,100,000
Quarterly principal payment period two				12,100,000
Quarterly principal payment period three				18,200,000
Term loan A-1 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
Term loan A-1 [Member] | Ntelos Holding, Corp
Debt Instrument [Line Items]
Line of credit facility amount borrowed	$ 485,000,000
Term loan A-2 [Member]
Debt Instrument [Line Items]
Term of credit facility	7 years
Maximum borrowing capacity	$ 400,000,000
Proceeds from line of credit		$ 25,000,000	$ 50,000,000
Quarterly principal payment period one				$ 10,000,000
Term loan A-2 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Term loan A-2 [Member] | Ntelos Holding, Corp
Debt Instrument [Line Items]
Line of credit facility amount borrowed	$ 325,000,000
Term loan A-2 [Member] | Delayed Draw Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility remaining borrowing capacity	$ 75,000,000