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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 178,812 | $ 176,683
Accumulated amortization | (100,635) | (92,578)
Net carrying amount | 78,177 | 84,105
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 100,094 | 100,146
Accumulated amortization | (45,366) | (40,661)
Net carrying amount | 54,728 | 59,485
Purchased Software Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 41,250 | 39,069
Accumulated amortization | (31,641) | (30,626)
Net carrying amount | 9,609 | 8,443
Technology Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 28,800 | 28,800
Accumulated amortization | (23,325) | (21,006)
Net carrying amount | 5,475 | 7,794
Trade Names and Trademarks [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 7,800 | 7,800
Accumulated amortization | 0 | 0
Net carrying amount | 7,800 | 7,800
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 868 | 868
Accumulated amortization | (303) | (285)
Net carrying amount | $ 565 | $ 583

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