Nature of Operations (Details) - megahertz	Dec. 31, 2018	Dec. 31, 1999
Unusual or Infrequent Item, or Both [Line Items]
Megahertz spectrum range used	1,900	1,900
Minimum
Unusual or Infrequent Item, or Both [Line Items]
Megahertz spectrum range used	800	800
Maximum
Unusual or Infrequent Item, or Both [Line Items]
Megahertz spectrum range used	2,500,000	2,500,000