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Compenation Plans (Schedule of Stock Option Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shares        
Outstanding at Beginning of year 328,700 1,172,150 1,498,150  
Granted 9,830    40,000  
Exercised (217,820) (843,450) (366,000)  
Canceled (250)        
Outstanding at End of year 120,460 328,700 1,172,150 1,498,150
Exercisable Options Outstanding at December 31, 2012 52,583      
Non-Vested Options Outstanding at December 31, 2012 67,877      
Weighted-Average Exercise Price        
Outstanding at Beginning of year $ 8.58 $ 9.3 $ 9.0  
Granted $ 8.59    $ 9.7  
Exercised $ 7.92 $ 9.58 $ 8.11  
Canceled $ 8.69        
Outstanding at End of year $ 8.58 $ 8.58 $ 9.3 $ 9.0
Exercisable Options Outstanding at December 31, 2012 $ 8.65      
Non-Vested Options Outstanding at December 31, 2012 $ 9.22      
Weighted-Average Grant Date Fair Value        
Outstanding at Beginning of year $ 4.42 $ 4.46 $ 4.13  
Granted $ 32.57    $ 4.8  
Exercised $ 4.4 $ 4.48 $ 3.15  
Canceled $ 4.57        
Outstanding at End of year $ 6.76 $ 4.42 $ 4.46 $ 4.13
Exercisable Options Outstanding at December 31, 2012 $ 6.97      
Non-Vested Options Outstanding at December 31, 2012 $ 6.81      
Weighted-Average Remaining Contractual Life        
Granted 5 years 7 months 6 days    9 years  
Exercised 4 years 9 months 18 days 5 years 4 years 6 months  
Canceled 6 years 3 months 18 days        
Outstanding 5 years 8 months 12 days 6 years 2 months 12 days 6 years 8 months 12 days 7 years 1 month 6 days
Exercisable Options Outstanding at December 31, 2012 5 years 4 months 24 days      
Non-Vested Options Outstanding at December 31, 2012 5 years 7 months 6 days