Pension Plan and Other Postretirement Benefits, Benefit Obligation (Details) - NTELOS Holdings Corp. [Member] $ in Thousands	May 06, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, at acquisition	$ 22,813
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations, at acquisition	37,443
Fair value of plan assets, at acquisition	22,813
Funded status [Abstract]
Total liability, at acquisition	(14,630)
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations, at acquisition	4,568
Fair value of plan assets, at acquisition	0
Funded status [Abstract]
Total liability, at acquisition	$ (4,568)