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Stock Based Compensation (Changes and Status of 2011 Restricted Stock Nonvested Shares) (Details) (USD $)
1 Months Ended 12 Months Ended
Aug. 02, 2011
Jan. 03, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Fair value          
Granted, weighted average grant date fair value (dollars per share)       $ 0  
Key Management 2011 Restricted Stock Plan [Member]
         
Nonvested Shares          
Beginning Balance (shares)     0    
Issued (shares)     25,355    
Vested (shares)     (13,559) 0 0
Forfeited (shares)     (775)    
Ending Balance (shares)     11,021 0  
Weighted Average Fair value          
Beginning Balance, weighted average grant date fair value (dollars per share)     $ 0.00    
Granted, weighted average grant date fair value (dollars per share) $ 69.37 $ 63.96 $ 68.68    
Vested, weighted average grant date fair value (dollars per share)     $ 68.62    
Forfeited, weighted average grant date fair value (dollars per share)     $ 69.37    
Ending Balance, weighted average grant date fair value (dollars per share)     $ 68.72 $ 0.00