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Stock-Based Compensation (Stock Option Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Option Exercise Price Grouping [Member]
   
Intrinsic Value of Options Exercised [Abstract]    
Intrinsic value of options exercised $ 7,238 $ 8,964
Options Granted At Discount [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options outstanding, Beginning Balance, Underlying Shares 179,559  
Granted, Underlying Shares 0  
Canceled, Underlying Shares 0  
Exercised, Underlying Shares (93,116)  
Options outstanding, Ending Balance, Underlying Shares 86,443  
Options, Weighted Average Exercise Price [Abstract]    
Options outstanding, Beginning Balance, Weighted Average Exercise Price $ 21.47  
Granted, Weighted Average Exercise Price $ 0.00  
Canceled, Weighted Average Exercise Price $ 0.00  
Exercised, Weighted Average Exercise Price $ 21.92  
Options outstanding, Ending Balance, Weighted Average Exercise Price $ 22.14  
Options, Exercisable, Number of Shares and Weighted Average Exercise Price [Abstract]    
Options exercisable, Underlying Shares 86,443  
Options exercisable, Weighted Average Exercise Price $ 22.14  
Option Grants Excluding Options Granted at Discount [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options outstanding, Beginning Balance, Underlying Shares 253,972  
Granted, Underlying Shares 0  
Canceled, Underlying Shares 0  
Exercised, Underlying Shares (58,326)  
Options outstanding, Ending Balance, Underlying Shares 195,646  
Options, Weighted Average Exercise Price [Abstract]    
Options outstanding, Beginning Balance, Weighted Average Exercise Price $ 36.48  
Granted, Weighted Average Exercise Price $ 0.00  
Canceled, Weighted Average Exercise Price $ 0.00  
Exercised, Weighted Average Exercise Price $ 30.09  
Options outstanding, Ending Balance, Weighted Average Exercise Price $ 39.02  
Options, Exercisable, Number of Shares and Weighted Average Exercise Price [Abstract]    
Options exercisable, Underlying Shares 179,176  
Options exercisable, Weighted Average Exercise Price $ 37.31