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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 169,958 | $ 167,103
Accumulated amortization | (79,464) | (70,817)
Net carrying amount | 90,494 | 96,286
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 100,183 | 100,053
Accumulated amortization | (32,770) | (27,883)
Net carrying amount | 67,413 | 72,170
Purchased Software Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 34,307 | 31,582
Accumulated amortization | (29,327) | (28,508)
Net carrying amount | 4,980 | 3,074
Technology Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 26,800 | 26,800
Accumulated amortization | (17,112) | (14,189)
Net carrying amount | 9,688 | 12,611
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 | (255) | (237)
Net carrying amount | $ 613 | $ 631

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