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Incentive Plans (Tables)
3 Months Ended
Mar. 31, 2012
Incentive Plans [Abstract]  
Summary of activity in outstanding grants
         

Outstanding grants at January 1, 2012

    870,760  

Grants during the year

    272,150  

Grants vested and paid during the year

    (187,096

Forfeitures during the year

    (832
   

 

 

 

Outstanding grants at March 31, 2012

    954,982