Intangible Asset and Goodwill (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Components of intangible assets
Gross Carrying Amount	$ 276,368	$ 216,714
Accumulated Amortization	(162,043)	(152,448)
Net Carrying Amount	114,325	64,266
Amortization expense for intangible assets	7,719		$ 6,322
Existing technology
Components of intangible assets
Gross Carrying Amount	212,244	185,321
Accumulated Amortization	(133,426)	(127,028)
Net Carrying Amount	$ 78,818	$ 58,293
Existing technology | Minimum [Member]
Components of intangible assets
Useful Life (in years)	3 years	3 years
Existing technology | Maximum [Member]
Components of intangible assets
Useful Life (in years)	10 years	10 years
Customer contracts and contractual relationships
Components of intangible assets
Gross Carrying Amount	$ 63,824	$ 31,093
Accumulated Amortization	(28,317)	(25,120)
Net Carrying Amount	$ 35,507	$ 5,973
Customer contracts and contractual relationships | Minimum [Member]
Components of intangible assets
Useful Life (in years)	1 year	1 year
Customer contracts and contractual relationships | Maximum [Member]
Components of intangible assets
Useful Life (in years)	10 years	10 years
Non-compete agreements
Components of intangible assets
Useful Life (in years)	3 years	3 years
Gross Carrying Amount	$ 300	$ 300
Accumulated Amortization	(300)	(300)
Net Carrying Amount	0	0
Favorable contracts
Components of intangible assets
Net Carrying Amount	6,900	$ 0
Cash received related to favorable contracts	$ 1,700