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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Acquired Intangible Assets |  |  |
Accumulated Amortization |  | $ 142,465 | $ 125,825
Intangible Assets, Gross (Excluding Goodwill) |  | 513,180 | 467,251
Intangible Assets, Net (Excluding Goodwill) |  | 370,715 | 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 |  | 345,491 | 319,934
Accumulated Amortization |  | 81,947 | 69,008
Net Balance |  | $ 263,544 | 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 |  | $ 87,622 | 76,206
Accumulated Amortization |  | 46,707 | 44,611
Net Balance |  | $ 40,915 | 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 |  | $ 61,092 | 50,917
Accumulated Amortization |  | 9,369 | 7,086
Net Balance |  | $ 51,723 | 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 |  | $ 6,379 | 7,598
Accumulated Amortization |  | 4,256 | 4,947
Net Balance |  | $ 2,123 | 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 |  | 186 | 173
Net Balance |  | $ 123 | $ 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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