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
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 475,239 $ 477,301
Accumulated Amortization (350,200) (335,179)
Net Book Value 125,039 142,122
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 303,424 304,601
Accumulated Amortization (230,184) (220,420)
Net Book Value 73,240 84,181
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 18,887 19,708
Accumulated Amortization (14,304) (14,279)
Net Book Value 4,583 5,429
Trademarks and trade names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 27,281 27,248
Accumulated Amortization (18,914) (18,245)
Net Book Value 8,367 9,003
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 106,106 106,203
Accumulated Amortization (67,827) (63,435)
Net Book Value 38,279 42,768
Capitalized software development costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,541 19,541
Accumulated Amortization (18,971) (18,800)
Net Book Value $ 570 $ 741