Quarterly report pursuant to Section 13 or 15(d)

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

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Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,993 $ 2,631 $ 5,939 $ 5,208
Employee Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense 913 862 1,829 1,743
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,080 $ 1,769 $ 4,110 $ 3,465