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Stock Based Compensation (Changes and Status of Key Management 2008 Restricted Stock Nonvested Shares) (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
Aug. 02, 2011
Key Management 2008 Restricted Stock Plan [Member]
Dec. 31, 2012
Key Management 2008 Restricted Stock Plan [Member]
Dec. 31, 2010
Key Management 2008 Restricted Stock Plan [Member]
Nonvested Shares        
Beginning Balance (shares)     11,089  
Issued (shares)     17,343  
Vested (shares)     (11,492) 0
Forfeited (shares)     (260)  
Ending Balance (shares)     16,680  
Weighted Average Fair value        
Beginning Balance, weighted average grant date fair value (dollars per share)     $ 63.20  
Granted, weighted average grant date fair value (dollars per share) $ 0 $ 69.37 $ 52.69  
Vested, weighted average grant date fair value (dollars per share)     $ 56.56  
Forfeited, weighted average grant date fair value (dollars per share)     $ 69.37  
Ending Balance, weighted average grant date fair value (dollars per share)     $ 56.75