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Share-Based Compensation (Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)
3 Months Ended
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Number of Shares [Roll Forward]  
Beginning balance, Number of shares 156,510
Granted, Number of shares 71,429
Converted into shares of common stock, Number of shares (35,303)
Forfeited/expired, Number of shares (1,754)
Ending balance, Number of shares 190,882
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance, Weighted average grant date fair value $ 20.83
Granted, Weighted Average grant date fair value $ 23.41
Converted into shares of common stock, Weighted average grant date fair value $ 22.48
Forfeited/expired, Weighted average grant date fair value $ 25.97
Ending balance, Weighted average grant date fair value $ 21.44