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Stock-Based Compensation And Earnings Per Share (Summary Of Non-Vested Restricted Stock Activity) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Service-Based Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning Balance 37,815
Number of Shares, Granted   
Number of Shares, Vested   
Number of Shares, Exercised (24,076)
Number of Shares, Forfeited (1,656)
Number of Shares, Ending Balance 12,083
Weighted Average Grant Date Fair Value, Beginning Balance $ 26.99
Weighted Average Grant Date Fair Value, Granted   
Weighted Average Grant Date Fair Value, Vested   
Weighted Average Grant Date Fair Value, Exercised $ 21.65
Weighted Average Grant Date Fair Value, Forfeited $ 21.52
Weighted Average Grant Date Fair Value, Ending Balance $ 21.52
Market Condition Restricted Stock Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning Balance 23,192
Number of Shares, Granted   
Number of Shares, Vested   
Number of Shares, Forfeited (23,192)
Number of Shares, Ending Balance   
Weighted Average Grant Date Fair Value, Beginning Balance $ 15.69
Weighted Average Grant Date Fair Value, Granted   
Weighted Average Grant Date Fair Value, Vested   
Weighted Average Grant Date Fair Value, Forfeited $ 15.69
Weighted Average Grant Date Fair Value, Ending Balance