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Stock Based Compensation (Changes and Status of Key Management 2002 Restricted Stock Nonvested Shares) (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Aug. 02, 2011
Key Management 2002 Restricted Stock Plan [Member]
Dec. 31, 2012
Key Management 2002 Restricted Stock Plan [Member]
Dec. 31, 2002
Key Management 2002 Restricted Stock Plan [Member]
Nonvested Shares        
Beginning Balance (shares)     16,379  
Granted (shares)     0  
Vested (shares)     (16,379)  
Forfeited (shares)     0  
Ending Balance (shares)     0  
Weighted Average Fair value        
Beginning Balance, weighted average grant date fair value (dollars per share)     $ 45.17  
Granted, weighted average grant date fair value (dollars per share) $ 0 $ 69.37 $ 0.00 $ 25.65
Vested, weighted average grant date fair value (dollars per share)     $ 45.17  
Forfeited, weighted average grant date fair value (dollars per share)     $ 0.00  
Ending Balance, weighted average grant date fair value (dollars per share)     $ 0.00