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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 173,858 | $ 172,996
Accumulated amortization | (84,801) | (82,132)
Net carrying amount | 89,057 | 90,864
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 100,234 | 100,200
Accumulated amortization | (35,992) | (34,372)
Net carrying amount | 64,242 | 65,828
Purchased Software Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 36,156 | 35,328
Accumulated amortization | (29,880) | (29,612)
Net carrying amount | 6,276 | 5,716
Technology Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 28,800 | 28,800
Accumulated amortization | (18,662) | (17,887)
Net carrying amount | 10,138 | 10,913
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 | (267) | (261)
Net carrying amount | $ 601 | $ 607

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