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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 177,402 | $ 176,683
Accumulated amortization | (95,287) | (92,578)
Net carrying amount | 82,115 | 84,105
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 100,123 | 100,146
Accumulated amortization | (42,224) | (40,661)
Net carrying amount | 57,899 | 59,485
Purchased Software Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 39,811 | 39,069
Accumulated amortization | (30,991) | (30,626)
Net carrying amount | 8,820 | 8,443
Technology Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 28,800 | 28,800
Accumulated amortization | (21,781) | (21,006)
Net carrying amount | 7,019 | 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 | (291) | (285)
Net carrying amount | $ 577 | $ 583

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