Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details)

v3.8.0.1
Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,558 $ 3,001 $ 8,277 $ 8,454
Employee Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 834 1,008 2,843 2,989
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,724 $ 1,993 $ 5,434 $ 5,465