Retirement Plans - Fair Value of Assets (Details) $ in Thousands	8 Months Ended
	Dec. 31, 2016 USD ($)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets as of December 31, 2016	$ 0
Ntelos Holding, Corp [Member] | Pension Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets, at acquisition	22,813
Actual return on Plan assets	1,722
Benefits paid	(340)
Plan expenses	(121)
Plan assets as of December 31, 2016	24,074
Funded status: Net liability as of December 31, 2016	(10,282)
Ntelos Holding, Corp [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets, at acquisition	0
Actual return on Plan assets	0
Benefits paid	0
Plan expenses	0
Funded status: Net liability as of December 31, 2016	$ (4,250)