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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Acquired Intangible Assets |  |  |
Accumulated Amortization |  | $ 119,730 | $ 104,764
Intangible Assets, Gross (Excluding Goodwill) |  | 297,040 | 281,106
Intangible Assets, Net (Excluding Goodwill) |  | 177,310 | 176,342
Tradenames |  |  |
Acquired Intangible Assets |  |  |
Indefinite-Lived Intangible Assets |  | 7,600 | 7,600
Purchased research and development |  |  |
Acquired Intangible Assets |  |  |
Indefinite-Lived Intangible Assets |  | 4,687 | 4,687
Customer Relationships |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross |  | 200,497 | 191,919
Accumulated Amortization |  | 64,747 | 54,889
Net Balance |  | $ 135,750 | 137,030
Customer Relationships | Minimum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 6 years | 6 years |
Customer Relationships | Maximum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 16 years | 16 years |
Patents |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 61,546 | 58,787
Accumulated Amortization |  | 43,247 | 40,079
Net Balance |  | $ 18,299 | 18,708
Patents | Minimum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 3 years | 3 years |
Patents | Maximum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 19 years | 19 years |
Tradenames |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 15,209 | 10,885
Accumulated Amortization |  | 6,652 | 5,507
Net Balance |  | $ 8,557 | 5,378
Tradenames | Minimum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 3 years | 3 years |
Tradenames | Maximum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 15 years | 15 years |
Non-compete Agreements |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 7,193 | 6,919
Accumulated Amortization |  | 4,919 | 4,148
Net Balance |  | $ 2,274 | 2,771
Non-compete Agreements | Minimum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 3 years | 3 years |
Non-compete Agreements | Maximum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 6 years | 6 years |
Other |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 308 | 309
Accumulated Amortization |  | 165 | 141
Net Balance |  | $ 143 | $ 168
Other | Minimum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 2 years | 2 years |
Other | Maximum |  |  |
Acquired Intangible Assets |  |  |
Estimated Useful Life in Years | 12 years | 12 years |

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