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Stockholders' Equity (Schedule Of Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation $ 20,352 $ 19,562 $ 13,840
Cost of revenue [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 2,311 2,133 1,313
Research and development [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 8,506 8,257 5,196
Sales, general and administrative [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation $ 9,535 $ 9,172 $ 7,331