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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, 2021 | Dec. 31, 2020
Acquired Intangible Assets |  |
Accumulated Amortization | $ 167,647 | $ 158,616
Intangible Assets, Gross (Excluding Goodwill) | 575,246 | 579,501
Intangible Assets, Net (Excluding Goodwill) | 407,599 | 420,885
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 | 395,669 | 398,613
Accumulated Amortization | 102,042 | 95,443
Net Balance | $ 293,627 | $ 303,170
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 | 17 years | 17 years
Patents |  |
Acquired Intangible Assets |  |
Finite-Lived Intangible Assets, Gross | $ 91,865 | $ 92,128
Accumulated Amortization | 48,421 | 47,090
Net Balance | $ 43,444 | $ 45,038
Patents | Minimum |  |
Acquired Intangible Assets |  |
Estimated Useful Life in Years | 3 years | 3 years
Patents | Maximum |  |
Acquired Intangible Assets |  |
Estimated Useful Life in Years | 20 years | 20 years
Tradenames |  |
Acquired Intangible Assets |  |
Finite-Lived Intangible Assets, Gross | $ 68,936 | $ 69,686
Accumulated Amortization | 12,489 | 11,272
Net Balance | $ 56,447 | $ 58,414
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 | $ 6,179 | $ 6,478
Accumulated Amortization | 4,497 | 4,617
Net Balance | $ 1,682 | $ 1,861
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 | $ 310 | $ 309
Accumulated Amortization | 198 | 194
Net Balance | $ 112 | $ 115
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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