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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, 2019 | Dec. 31, 2018
Acquired Intangible Assets |  |
Accumulated Amortization | $ 110,608 | $ 104,764
Intangible Assets, Gross (Excluding Goodwill) | 281,875 | 281,106
Intangible Assets, Net (Excluding Goodwill) | 171,267 | 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 | 192,853 | 191,919
Accumulated Amortization | 58,682 | 54,889
Net Balance | $ 134,171 | $ 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 | $ 58,730 | $ 58,787
Accumulated Amortization | 41,350 | 40,079
Net Balance | $ 17,380 | $ 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 | $ 10,832 | $ 10,885
Accumulated Amortization | 5,847 | 5,507
Net Balance | $ 4,985 | $ 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 | $ 6,864 | $ 6,919
Accumulated Amortization | 4,580 | 4,148
Net Balance | $ 2,284 | $ 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 | $ 309 | $ 309
Accumulated Amortization | 149 | 141
Net Balance | $ 160 | $ 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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