Revenue Recognition (Details) - Disaggregation of Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
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
Revenue from Contract with Customer Benchmark [Member] | Month To Month And Other Contracted Revenue [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	76.69%	80.58%	78.55%	79.95%
Revenue from Contract with Customer Benchmark [Member] | Outside Of The Scope Of ASC 606 [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	21.64%	17.66%	20.04%	18.24%
Revenue from Contract with Customer Benchmark [Member] | CPE And Equipment Sales And Installation [Member]
Revenue Recognition (Details) - Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	1.67%	1.76%	1.41%	1.81%