Intangible Assets and Goodwill (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of intangible assets
Gross Carrying Amount	$ 217,595	$ 224,765
Accumulated Amortization	(100,423)	(71,592)
Finite-lived intangible assets	117,172	153,173
Amortization expense for intangible assets	28,909	30,345	20,191
Minimum
Components of intangible assets
Useful Life (in years)	1 year	1 year
Maximum
Components of intangible assets
Useful Life (in years)	10 years	10 years
Existing technology
Components of intangible assets
Gross Carrying Amount	186,202	191,815
Accumulated Amortization	(80,961)	(57,240)
Finite-lived intangible assets	105,241	134,575
Existing technology | Minimum
Components of intangible assets
Useful Life (in years)	3 years	3 years
Existing technology | Maximum
Components of intangible assets
Useful Life (in years)	10 years	10 years
Customer contracts and contractual relationships
Components of intangible assets
Gross Carrying Amount	31,093	32,650
Accumulated Amortization	(19,204)	(14,194)
Finite-lived intangible assets	11,889	18,456
Customer contracts and contractual relationships | Minimum
Components of intangible assets
Useful Life (in years)	1 year	1 year
Customer contracts and contractual relationships | Maximum
Components of intangible assets
Useful Life (in years)	10 years	10 years
Non-competition agreements
Components of intangible assets
Gross Carrying Amount	300	300
Accumulated Amortization	(258)	(158)
Finite-lived intangible assets	$ 42	$ 142
Useful Life (in years)	3 years	3 years