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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 71,376 |  | $ 66,627
Indefinite-Lived Intangible Assets - Purchased research and development | 4,687 |  | 4,687
Intangible Assets, Gross (Excluding Goodwill) | 180,929 |  | 167,562
Intangible Assets, Net (Excluding Goodwill) | 109,553 | $ 104,109 | 100,935
Customer Relationships |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | 106,316 |  | 94,560
Finite-Lived Intangible Assets, Accumulated Amortization | 30,226 |  | 30,514
Finite-Lived Intangible Assets, Net | $ 76,090 |  | $ 64,046
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 | $ 55,172 |  | $ 54,293
Finite-Lived Intangible Assets, Accumulated Amortization | 32,290 |  | 28,255
Finite-Lived Intangible Assets, Net | $ 22,882 |  | $ 26,038
Patents | Minimum |  |  |
Acquired Intangible Assets |  |  |
Estimated useful life in years | 3 years |  | 3 years
Patents | Maximum |  |  |
Acquired Intangible Assets |  |  |
Estimated useful life in years | 19 years |  | 19 years
Tradenames |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | $ 9,876 |  | $ 8,935
Finite-Lived Intangible Assets, Accumulated Amortization | 5,332 |  | 4,751
Finite-Lived Intangible Assets, Net | $ 4,544 |  | $ 4,184
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 | $ 4,569 |  | $ 4,493
Finite-Lived Intangible Assets, Accumulated Amortization | 3,460 |  | 2,800
Finite-Lived Intangible Assets, Net | $ 1,109 |  | $ 1,693
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 |  | $ 594
Finite-Lived Intangible Assets, Accumulated Amortization | 68 |  | 307
Finite-Lived Intangible Assets, Net | $ 241 |  | $ 287
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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