Property and Equipment and Intangible Assets (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets
Intangible Assets	$ 38,464,000	$ 67,446,000
Accumulated Amortization	(21,639,000)	(31,598,000)
Amortization expense	6,000,000	11,000,000	13,000,000
Estimated future amortization of identifiable intangible assets
2015	4,423,000
2016	4,299,000
2017	2,967,000
2018	2,231,000
2019	1,825,000
Thereafter	1,080,000
Total	16,825,000
Wireless
Goodwill
Goodwill	120,000,000	126,000,000
Minimum
Intangible Assets
Useful life	2 years
Maximum
Intangible Assets
Useful life	20 years
Technology-based
Intangible Assets
Intangible Assets	7,210,000	34,078,000
Accumulated Amortization	(4,445,000)	(12,222,000)
Trademarks
Intangible Assets
Intangible Assets	19,704,000	20,424,000
Accumulated Amortization	(5,644,000)	(6,432,000)
Contract-based
Intangible Assets
Intangible Assets	8,650,000	8,650,000
Accumulated Amortization	(8,650,000)	(8,650,000)
Customer relationships
Intangible Assets
Intangible Assets	2,900,000	4,294,000
Accumulated Amortization	$ (2,900,000)	$ (4,294,000)