Acquisitions - Intangible Assets Acquired (Details) (Sanbolic, Inc. [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jan. 08, 2015	Jan. 08, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Core and product technologies	$ 45,300	$ 45,300
Core and Product Technologies [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Core and product technologies	43,800	43,800
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Core and product technologies	$ 1,500	$ 1,500
Useful life of intangible assets acquired	2 years
Minimum [Member] | Core and Product Technologies [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets acquired	5 years
Maximum [Member] | Core and Product Technologies [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Useful life of intangible assets acquired	6 years