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Stock-Based Compensation (Classification Of Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation $ 12,854 $ 12,222 $ 35,745 $ 34,351
Cost Of Revenues [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation 1,779 1,722 5,367 5,202
Sales And Marketing [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation 1,129 1,683 4,219 4,800
Research And Development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation 1,676 1,478 4,966 4,890
General And Administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation $ 8,270 $ 7,339 $ 21,193 $ 19,459