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Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total pre-tax stock-based compensation expense charged against income $ 884us-gaap_AllocatedShareBasedCompensationExpense [1] $ 762us-gaap_AllocatedShareBasedCompensationExpense [1]
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total pre-tax stock-based compensation expense charged against income 719us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember		 646us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total pre-tax stock-based compensation expense charged against income 58us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 26us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Employee Stock Purchase Plan (ESPP) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total pre-tax stock-based compensation expense charged against income $ 107us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 $ 90us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
[1] Stock-based compensation expense is recorded in the selling, general and administrative caption in our consolidated statements of comprehensive income.