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Compensation Plans (Schedule of Stock Option Activity) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Shares        
Outstanding at Beginning of year 120,460 328,700 1,172,150  
Granted    9,830     
Exercised (63,239) (217,820) (843,450)  
Canceled    (250)     
Outstanding at End of year 57,221 120,460 328,700 1,172,150
Exercisable Options Outstanding at December 31, 2013 46,851      
Non-Vested Options Outstanding at December 31, 2013 10,370      
Weighted-Average Exercise Price        
Outstanding at Beginning of year $ 8.58 $ 8.58 $ 9.30  
Granted    $ 8.59     
Exercised $ 8.51 $ 7.92 $ 9.58  
Canceled    $ 8.69     
Outstanding at End of year $ 8.66 $ 8.58 $ 8.58 $ 9.30
Exercisable Options Outstanding at December 31, 2013 $ 8.66      
Non-Vested Options Outstanding at December 31, 2013 $ 8.68      
Weighted-Average Grant Date Fair Value        
Outstanding at Beginning of year $ 6.76 $ 4.42 $ 4.46  
Granted    $ 32.57    
Exercised $ 6.86 $ 4.40 $ 4.48  
Canceled    $ 4.57    
Outstanding at End of year $ 6.65 $ 6.76 $ 4.42 $ 4.46
Exercisable Options Outstanding at December 31, 2013 $ 6.89      
Non-Vested Options Outstanding at December 31, 2013 $ 5.57      
Weighted-Average Remaining Contractual Life        
Granted    5 years 7 months 6 days    
Exercised 4 years 4 months 24 days 4 years 9 months 18 days 5 years  
Canceled    6 years 3 months 18 days    
Outstanding 5 years 5 years 8 months 12 days 6 years 2 months 12 days 6 years 8 months 12 days
Exercisable Options Outstanding at December 31, 2013 5 years      
Non-Vested Options Outstanding at December 31, 2013 5 years 3 months 18 days