Property and Equipment and Intangible Assets (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Intangible Assets
Intangible Assets	$ 71,588,000		$ 75,551,000
Accumulated Amortization	(28,653,000)		(28,115,000)
Amortization expense	5,000,000	3,000,000
Estimated future amortization of identifiable intangible assets
2013 (remaining nine months)	8,239,000
2014	9,871,000
2015	9,150,000
2016	8,362,000
2017	3,138,000
Thereafter	4,175,000
Total	42,935,000
Goodwill
Goodwill	126,000,000		126,000,000
Minimum
Intangible Assets
Useful life	1 year
Maximum
Intangible Assets
Useful life	10 years
Technology-based
Intangible Assets
Intangible Assets	35,078,000		39,066,000
Accumulated Amortization	(7,414,000)		(8,345,000)
Trademarks
Intangible Assets
Intangible Assets	18,236,000		18,236,000
Accumulated Amortization	(4,586,000)		(3,907,000)
Contract-based
Intangible Assets
Intangible Assets	11,300,000		11,275,000
Accumulated Amortization	(10,318,000)		(10,127,000)
Customer relationships
Intangible Assets
Intangible Assets	6,974,000		6,974,000
Accumulated Amortization	$ (6,335,000)		$ (5,736,000)