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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Acquired Intangible Assets |  |
Accumulated Amortization | $ 135,152 | $ 125,825
Intangible Assets, Gross (Excluding Goodwill) | 513,084 | 467,251
Intangible Assets, Net (Excluding Goodwill) | 377,932 | 341,426
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 | 344,078 | 319,934
Accumulated Amortization | 75,473 | 69,008
Net Balance | $ 268,605 | $ 250,926
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 | $ 87,989 | $ 76,206
Accumulated Amortization | 45,970 | 44,611
Net Balance | $ 42,019 | $ 31,595
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 | $ 60,823 | $ 50,917
Accumulated Amortization | 8,284 | 7,086
Net Balance | $ 52,539 | $ 43,831
Tradenames | Minimum |  |
Acquired Intangible Assets |  |
Estimated Useful Life in Years | 3 years | 3 years
Tradenames | Maximum |  |
Acquired Intangible Assets |  |
Estimated Useful Life in Years | 20 years | 20 years
Non-compete Agreements |  |
Acquired Intangible Assets |  |
Finite-Lived Intangible Assets, Gross | $ 7,598 | $ 7,598
Accumulated Amortization | 5,244 | 4,947
Net Balance | $ 2,354 | $ 2,651
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 | $ 309 | $ 309
Accumulated Amortization | 181 | 173
Net Balance | $ 128 | $ 136
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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