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Property and Equipment and Intangible Assets - Estimated Future Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible Assets
Intangible Assets	$ 128,220	$ 139,769
Accumulated Amortization	(118,166)	(122,314)
Amortization expense	7,000	10,000	$ 8,000
Goodwill	126,000	126,000
Estimated future amortization of identifiable intangible assets
2020	3,816
2021	1,288
2022	666
2023	654
2024	654
Thereafter	2,976
Total	10,054
Wireless
Intangible Assets
Goodwill	$ 126,000	126,000
Minimum
Intangible Assets
Useful life	5 years
Maximum
Intangible Assets
Useful life	20 years
Technology-based
Intangible Assets
Intangible Assets	$ 63,077	63,077
Accumulated Amortization	(57,414)	(53,998)
Trademarks
Intangible Assets
Intangible Assets	37,010	37,010
Accumulated Amortization	(32,619)	(28,634)
Contract-based
Intangible Assets
Intangible Assets	4,500	13,149
Accumulated Amortization	(4,500)	(13,149)
Customer relationships
Intangible Assets
Intangible Assets	23,633	26,533
Accumulated Amortization	$ (23,633)	$ (26,533)