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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount $ 165,516 $ 165,314
Accumulated amortization (61,056) (57,906)
Net carrying amount 104,460 107,408
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 100,137 100,092
Accumulated amortization (21,885) (19,822)
Net carrying amount 78,252 80,270
Purchased Software Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 29,911 29,754
Accumulated amortization (27,699) (27,394)
Net carrying amount 2,212 2,360
Technology Licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 26,800 26,800
Accumulated amortization (11,253) (10,477)
Net carrying amount 15,547 16,323
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 (219) (213)
Net carrying amount $ 649 $ 655