Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

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

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Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 457,963 $ 477,301
Accumulated Amortization (350,689) (335,179)
Net Book Value 107,274 142,122
Developed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 299,100 304,601
Accumulated Amortization (236,375) (220,420)
Net Book Value 62,725 84,181
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,127 19,708
Accumulated Amortization (5,752) (14,279)
Net Book Value 4,375 5,429
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 26,212 27,248
Accumulated Amortization (19,067) (18,245)
Net Book Value 7,145 9,003
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 102,984 106,203
Accumulated Amortization (70,353) (63,435)
Net Book Value 32,631 42,768
Capitalized Software Development Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 19,540 19,541
Accumulated Amortization (19,142) (18,800)
Net Book Value $ 398 $ 741