Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Total gross property and equipment		$ 2,105,722	$ 2,014,936	$ 1,946,218
Less accumulated depreciation		(1,095,355)	(1,004,485)	(912,960)
Total property and equipment, net		1,010,367	1,010,451		$ 1,008,702	$ 1,008,991	$ 1,005,579	$ 1,014,028	$ 1,017,638	$ 1,024,460
Depreciation expense		93,000	93,000	$ 93,200
Land [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment	[1]	76,610	72,665
Communications infrastructure [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment		$ 1,992,394	1,918,766
Property, plant and equipment, useful life		20 years
Communications infrastructure [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		1 year
Communications infrastructure [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		20 years
Construction in Process [Member]
Property, Plant and Equipment [Line Items]
Total gross property and equipment		$ 36,718	$ 23,505

[1] Includes land owned through fee interests and perpetual easements.