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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 183,879 $ 179,195
Accumulated amortization (113,902) (103,402)
Net carrying amount 69,977 75,793
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 100,228 100,123
Accumulated amortization (53,429) (46,981)
Net carrying amount 46,799 53,142
Purchased Software Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 46,183 41,604
Accumulated amortization (33,307) (32,012)
Net carrying amount 12,876 9,592
Technology Licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 28,800 28,800
Accumulated amortization (26,833) (24,100)
Net carrying amount 1,967 4,700
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 (333) (309)
Net carrying amount $ 535 $ 559