Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Successor [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,442,000
Subsidy and other revenue	5,000
Total revenue	1,447,000
Successor [Member] | Data And Internet Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	836,000
Successor [Member] | Voice Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	386,000
Successor [Member] | Video Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137,000
Successor [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83,000
Successor [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	776,000
Successor [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 666,000
Predecessor [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		$ 1,593,000
Subsidy and other revenue		83,000
Total revenue		1,676,000
Predecessor [Member] | Data And Internet Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		842,000
Predecessor [Member] | Voice Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		487,000
Predecessor [Member] | Video Services [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		169,000
Predecessor [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		95,000
Predecessor [Member] | Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		850,000
Predecessor [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers		$ 743,000