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Stock Based Compensation (Changes and Status of 2010 Executive Restricted Stock Nonvested Shares) (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
Mar. 23, 2010
2010 Executive Restricted Stock Plan [Member]
Dec. 31, 2012
2010 Executive Restricted Stock Plan [Member]
Dec. 31, 2010
2010 Executive Restricted Stock Plan [Member]
Nonvested Shares        
Beginning Balance (shares)     1,806  
Issued (shares)     0  
Vested (shares)     (1,172)  
Forfeited (shares)     0  
Ending Balance (shares)     634  
Weighted Average Fair value        
Beginning Balance, weighted average grant date fair value (dollars per share)     $ 54.38  
Granted, weighted average grant date fair value (dollars per share) $ 0 $ 54.38 $ 0.00 $ 0
Vested, weighted average grant date fair value (dollars per share)     $ 54.38  
Forfeited, weighted average grant date fair value (dollars per share)     $ 0.00  
Ending Balance, weighted average grant date fair value (dollars per share)     $ 54.38