Current report of foreign issuer pursuant to Rules 13a-16 and 15d-16 Amendments

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details)

v3.8.0.1
Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 479,301 $ 477,705
Accumulated Amortization (326,494) (300,247)
Net Book Value 152,807 177,458
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 304,766 304,766
Accumulated Amortization (214,985) (198,632)
Net Book Value 89,781 106,134
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 20,180 19,009
Accumulated Amortization (13,817) (12,257)
Net Book Value 6,363 6,752
Trademarks and trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,829 27,819
Accumulated Amortization (17,882) (16,849)
Net Book Value 9,947 10,970
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 106,986 106,571
Accumulated Amortization (61,104) (54,258)
Net Book Value 45,882 52,313
Capitalized software development costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,540 19,540
Accumulated Amortization (18,706) (18,251)
Net Book Value $ 834 $ 1,289