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Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 461,799 | $ 457,963
Accumulated Amortization | (374,471) | (350,689)
Net Book Value | 87,328 | 107,274
Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 299,100 | 299,100
Accumulated Amortization | (252,136) | (236,375)
Net Book Value | 46,964 | 62,725
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 15,142 | 10,127
Accumulated Amortization | (7,067) | (5,752)
Net Book Value | 8,075 | 4,375
Trademarks and trade names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 25,991 | 26,212
Accumulated Amortization | (19,966) | (19,067)
Net Book Value | 6,025 | 7,145
Customer relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 102,936 | 102,984
Accumulated Amortization | (76,813) | (70,353)
Net Book Value | 26,123 | 32,631
Capitalized Software Development Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,630 | 19,540
Accumulated Amortization | (18,489) | (19,142)
Net Book Value | $ 141 | $ 398

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