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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2011
Share-Based Compensation [Abstract]  
Summary Of The Changes In The Number Of Outstanding Phantom Stock Shares
     Phantom
Stock Plan
    Director Phantom
Stock Plan
 

Balance of shares outstanding at December 31, 2010

     253,802        25,239  

Granted

     41,028        8,250  

Settled

     (13,381     0   
  

 

 

   

 

 

 

Balance of shares outstanding at December 31, 2011

     281,449        33,489