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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 100,506 | $ 85,487 | $ 90,658
Intangible Assets, Gross (Excluding Goodwill) | 272,230 | 220,248 | 220,790
Intangible Assets, Net (Excluding Goodwill) | 171,724 | 134,761 | 130,132
Customer Relationships |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | 187,804 | 138,941 | 138,687
Finite-Lived Intangible Assets, Accumulated Amortization | 52,204 | 39,792 | 42,276
Finite-Lived Intangible Assets, Net | $ 135,600 | $ 99,149 | 96,411
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 | $ 55,858 | $ 57,416 | 57,576
Finite-Lived Intangible Assets, Accumulated Amortization | 38,451 | 37,277 | 38,764
Finite-Lived Intangible Assets, Net | $ 17,407 | $ 20,139 | 18,812
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 | $ 15,922 | $ 10,416 | 10,995
Finite-Lived Intangible Assets, Accumulated Amortization | 5,828 | 4,708 | 5,381
Finite-Lived Intangible Assets, Net | $ 10,094 | $ 5,708 | 5,614
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 | $ 7,650 | $ 8,479 | 8,536
Finite-Lived Intangible Assets, Accumulated Amortization | 3,890 | 3,609 | 4,128
Finite-Lived Intangible Assets, Net | $ 3,760 | $ 4,870 | 4,408
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 | 133 | 101 | 109
Finite-Lived Intangible Assets, Net | $ 176 | $ 208 | 200
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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