Revenue Recognition (Details) - Disaggregation of Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Minimum [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
ContractTerm			3 years
Maximum [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
ContractTerm			10 years
Month To Month And Other Contracted Revenue [Member] | Long-term Contract with Customer [Member] | Revenue from Contract with Customer Benchmark [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	79.01%	79.08%	78.90%	78.44%
Outside Of The Scope Of ASC 606 [Member] | Long-term Contract with Customer [Member] | Revenue from Contract with Customer Benchmark [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	19.33%	19.74%	19.36%	20.19%
CPE And Equipment Sales And Installation [Member] | Long-term Contract with Customer [Member] | Revenue from Contract with Customer Benchmark [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	1.65%	1.18%	1.74%	1.37%