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Stock Based Compensation (Changes and Status of Director Restricted Stock Nonvested Shares) (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Director Restricted Stock Plan [Member]
Nonvested Shares    
Beginning Balance (shares)   2,976
Granted (shares)   5,340
Vested (shares)   (2,976)
Forfeited (shares)   0
Ending Balance (shares)   5,340
Weighted Average Fair value    
Beginning Balance, weighted average grant date fair value (dollars per share)   $ 67.16
Granted, weighted average grant date fair value (dollars per share) $ 0 $ 67.36
Vested, weighted average grant date fair value (dollars per share)   $ 67.16
Forfeited, weighted average grant date fair value (dollars per share)   $ 0.00
Ending Balance, weighted average grant date fair value (dollars per share)   $ 67.36