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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 185,748 | $ 183,879
Accumulated amortization | (117,864) | (113,902)
Net carrying amount | 67,884 | 69,977
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 100,189 | 100,228
Accumulated amortization | (56,562) | (53,429)
Net carrying amount | 43,627 | 46,799
Purchased Software Costs [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 48,091 | 46,183
Accumulated amortization | (34,110) | (33,307)
Net carrying amount | 13,981 | 12,876
Technology Licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 28,800 | 28,800
Accumulated amortization | (26,847) | (26,833)
Net carrying amount | 1,953 | 1,967
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 | (345) | (333)
Net carrying amount | $ 523 | $ 535

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