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)

v3.10.0.1
Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 460,942 $ 477,301
Accumulated Amortization (343,494) (335,179)
Net Book Value 117,448 142,122
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 299,643 304,601
Accumulated Amortization (231,654) (220,420)
Net Book Value 67,989 84,181
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,317 19,708
Accumulated Amortization (5,931) (14,279)
Net Book Value 4,386 5,429
Trademarks and trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,253 27,248
Accumulated Amortization (18,730) (18,245)
Net Book Value 8,523 9,003
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 104,188 106,203
Accumulated Amortization (68,122) (63,435)
Net Book Value 36,066 42,768
Capitalized software development costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,541 19,541
Accumulated Amortization (19,057) (18,800)
Net Book Value $ 484 $ 741