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Retirement Plans - Future Benefit Plan Payments (Details) - Ntelos Holding, Corp [Member]
$ in Thousands
Dec. 31, 2016
USD ($)
Pension Plan [Member]  
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2017 $ 684
2018 703
2019 752
2020 821
2021 924
Aggregate of next five years 6,409
Other Postretirement Benefit Plan [Member]  
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2017 187
2018 156
2019 160
2020 155
2021 170
Aggregate of next five years $ 925