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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 85,487 | $ 71,376 | $ 75,198
Intangible Assets, Gross (Excluding Goodwill) | 220,248 | 180,929 | 188,141
Intangible Assets, Net (Excluding Goodwill) | 134,761 | 109,553 | 112,943
Customer Relationships |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | 138,941 | 106,316 | 110,784
Finite-Lived Intangible Assets, Accumulated Amortization | 39,792 | 30,226 | 32,414
Finite-Lived Intangible Assets, Net | $ 99,149 | $ 76,090 | 78,370
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 | $ 57,416 | $ 55,172 | 56,468
Finite-Lived Intangible Assets, Accumulated Amortization | 37,277 | 32,290 | 34,066
Finite-Lived Intangible Assets, Net | $ 20,139 | $ 22,882 | 22,402
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 | $ 10,416 | $ 9,876 | 10,041
Finite-Lived Intangible Assets, Accumulated Amortization | 4,708 | 5,332 | 5,667
Finite-Lived Intangible Assets, Net | $ 5,708 | $ 4,544 | 4,374
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 | $ 8,479 | $ 4,569 | 5,852
Finite-Lived Intangible Assets, Accumulated Amortization | 3,609 | 3,460 | 2,975
Finite-Lived Intangible Assets, Net | $ 4,870 | $ 1,109 | 2,877
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 | 309
Finite-Lived Intangible Assets, Accumulated Amortization | 101 | 68 | 76
Finite-Lived Intangible Assets, Net | $ 208 | $ 241 | 233
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 |
Purchased research and development |  |  |
Acquired Intangible Assets |  |  |
Indefinite-Lived Intangible Assets - Purchased research and development | $ 4,687 | $ 4,687 | $ 4,687

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