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Share-Based Compensation (Schedule Of Selected Financial Impact Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit resulting from share-based compensation arrangements $ (6,229) $ (6,107) $ (5,584)
Net impact of share-based compensation on net income 13,655 11,992 10,990
Cost Of Revenue [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 2,138 1,937 1,841
Operating Expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense 17,746 16,162 14,733
Total Share-Based Compensation Expense Included In Consolidated Statements Of Income [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 19,884 $ 18,099 $ 16,574