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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

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