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Intangible Assets, Net (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]        
Total intangible assets amortization expenses $ 8,600,000 $ 9,200,000 $ 17,000,000 $ 18,500,000
Capitalized Software Development Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
Capitalized software development costs 13,700,000 7,600,000 26,000,000 16,000,000
Capitalized computer software amortization 5,500,000 4,300,000 10,800,000 8,600,000
Costs related to stock based compensation $ 528,000 $ 200,000 $ 954,000 $ 525,000
Minimum [Member] | Capitalized Software Development Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
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] | Capitalized Software Development Costs [Member]        
Finite-Lived Intangible Assets [Line Items]        
Useful life (in years)     6 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