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Stock Compensation (Summary Of Total Stock Compensation Expenses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense $ 1,864 $ 1,470
RSA, PSA, RSU, And PSU Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense 1,346 1,088
Stock Option And ESPP Option Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock compensation expense $ 518 $ 382