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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, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Acquired Intangible Assets |  |  |
Accumulated Amortization |  | $ 191,303 | $ 158,616
Intangible Assets, Gross (Excluding Goodwill) |  | 709,603 | 579,501
Intangible Assets, Net (Excluding Goodwill) |  | 518,300 | 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 |  | 450,736 | 398,613
Accumulated Amortization |  | 118,405 | 95,443
Net Balance |  | $ 332,331 | 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 |  | $ 109,195 | 92,128
Accumulated Amortization |  | 51,517 | 47,090
Net Balance |  | $ 57,678 | 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 |  | $ 125,012 | 69,686
Accumulated Amortization |  | 16,284 | 11,272
Net Balance |  | $ 108,728 | 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 |  | $ 12,064 | 6,478
Accumulated Amortization |  | 4,890 | 4,617
Net Balance |  | $ 7,174 | 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 |  | $ 309 | 309
Accumulated Amortization |  | 207 | 194
Net Balance |  | $ 102 | $ 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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