Intangible Assets, Net (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Costs related to stock based compensation			$ 18,000,000	$ 15,000,000
Total intangible assets amortization expenses	$ 8,900,000	$ 7,300,000
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Capitalized software development costs	9,600,000	9,600,000	12,000,000	18,000,000
Capitalized computer software amortization	4,600,000	3,000,000	9,200,000	6,100,000
Costs related to stock based compensation	$ 375,000	$ 422,000	$ 471,000	$ 800,000
Useful life (in years)			3 years
Minimum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)			3 years
Minimum [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)			10 years
Maximum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)			8 years
Maximum [Member] | Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)			17 years