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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Incentive Plans [Abstract]  
Summary of activity in outstanding grants
         

Outstanding grants at the beginning of the period

     753,868  

Grants during the period

     279,078  

Grants vested and paid during the period

     (162,186 ) 

Forfeitures during the period

     (416 ) 
   

 

 

  

Outstanding grants at the end of the period

     870,344