Operating Segments and Concentrations of Credit Risk (Major Customers) (Details) - Revenue Benchmark - Customer Concentration Risk	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Concentration Risk, Percentage	76.00%	74.00%	75.00%
T-Mobile [Member]
Concentration Risk, Percentage	38.00%	38.00%	35.00%
AT&T [Member]
Concentration Risk, Percentage	19.00%	18.00%	20.00%
Verizon Wireless [Member]
Concentration Risk, Percentage	19.00%	18.00%	20.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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