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Acquisitions, Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 95,936 | $ 77,362 | $ 90,658
Intangible Assets, Gross (Excluding Goodwill) | 276,627 | 191,673 | 220,790
Intangible Assets, Net (Excluding Goodwill) | 180,691 | 114,311 | 130,132
Customer Relationships |  |  |
Acquired Intangible Assets |  |  |
Finite-Lived Intangible Assets, Gross | 187,229 | 113,513 | 138,687
Finite-Lived Intangible Assets, Accumulated Amortization | 45,393 | 34,704 | 42,276
Finite-Lived Intangible Assets, Net | $ 141,836 | $ 78,809 | 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 | $ 59,415 | $ 57,347 | 57,576
Finite-Lived Intangible Assets, Accumulated Amortization | 40,130 | 34,850 | 38,764
Finite-Lived Intangible Assets, Net | $ 19,285 | $ 22,497 | 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 | $ 14,833 | $ 9,741 | 10,995
Finite-Lived Intangible Assets, Accumulated Amortization | 5,607 | 4,494 | 5,381
Finite-Lived Intangible Assets, Net | $ 9,226 | $ 5,247 | 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 | $ 10,154 | $ 6,076 | 8,536
Finite-Lived Intangible Assets, Accumulated Amortization | 4,689 | 3,230 | 4,128
Finite-Lived Intangible Assets, Net | $ 5,465 | $ 2,846 | 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 | 117 | 84 | 109
Finite-Lived Intangible Assets, Net | $ 192 | $ 225 | 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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