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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 172,996 | $ 167,103
Accumulated amortization | (82,132) | (70,817)
Net carrying amount | 90,864 | 96,286
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 100,200 | 100,053
Accumulated amortization | (34,372) | (27,883)
Net carrying amount | 65,828 | 72,170
Purchased Software Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 35,328 | 31,582
Accumulated amortization | (29,612) | (28,508)
Net carrying amount | 5,716 | 3,074
Technology Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 28,800 | 26,800
Accumulated amortization | (17,887) | (14,189)
Net carrying amount | 10,913 | 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 | (261) | (237)
Net carrying amount | $ 607 | $ 631

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