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Intangible Assets, Net (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]        
Total intangible assets amortization expenses $ 9,000,000 $ 9,000,000 $ 26,000,000 $ 24,000,000
Capitalized Software Development Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
Capitalized software development costs 11,700,000 5,500,000 24,000,000 23,000,000
Capitalized computer software amortization 4,400,000 4,100,000 14,000,000 10,000,000
Costs related to stock based compensation $ 480,000 $ 193,000 $ 950,000 $ 533,000
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