Pension Plan and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - NTELOS Holdings Corp. [Member] - USD ($) $ in Thousands	8 Months Ended	9 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Defined Benefit Pension Plan [Member]
Components of net periodic benefit cost (income):
Net periodic cost (income)		$ (100)
Defined Benefit Pension Plan [Member] | Scenario, Forecast [Member]
Components of net periodic benefit cost (income):
Service cost	$ 0
Interest cost	956
Expected return on plan assets	(1,018)
Net periodic cost (income)	(62)
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost (income):
Net periodic cost (income)		$ 100
Other Postretirement Benefit Plans [Member] | Scenario, Forecast [Member]
Components of net periodic benefit cost (income):
Service cost	18
Interest cost	108
Expected return on plan assets	0
Net periodic cost (income)	$ 126