Revenue Recognition (Details) - Disaggregation of Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Minimum [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Contract Term			3 years
Maximum [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Contract Term			10 years
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Month To Month And Other Contracted Revenue [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	79.36%	77.63%	79.05%	78.17%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Outside Of The Scope Of ASC 606 [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	19.03%	19.64%	19.25%	20.01%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | CPE And Equipment Sales And Installation [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	1.61%	2.73%	1.70%	1.82%