Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Advertising expense	$ 4,400	$ 2,700	$ 3,500
Fair value of projected benefit obligations	8,216	14,645
Pension Plan
Finite-Lived Intangible Assets [Line Items]
Fair value of projected benefit obligations	2,393	7,961
Ntelos Holding, Corp | Pension Plan
Finite-Lived Intangible Assets [Line Items]
Fair value of pension plan assets	31,100	27,000
Fair value of projected benefit obligations	$ 33,500	$ 34,900
Discount rate (as a percent)	2.74%	2.41%
Ntelos Pension Plan
Finite-Lived Intangible Assets [Line Items]
Pension benefits, vesting period	5 years
Vesting reductions, threshold age of recipient	65 years
Postretirement Medical Benefits Plan
Finite-Lived Intangible Assets [Line Items]
Fair value of projected benefit obligations	$ 3,506	$ 3,997
Discount rate (as a percent)	2.70%	2.32%