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Long-Term Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2011
Long-Term Incentive Plans [Abstract]  
Schedule of performance-based restricted stock units
                 
     Shares     Weighted
Average
Grant Date
Fair Value
 
   
   
   

Outstanding units at December 31, 2010.

    —       $ —    

Granted at target level

    78,131       58.83  

Adjustments above/(below) target level

    19,313       58.83  

Expired

    —         —    

Forfeited

    (879     58.83  
   

 

 

         

Outstanding units at December 31, 2011

    96,565     $ 58.83  
   

 

 

         

Vested units at December 31, 2011

    —            

Unvested units at December 31, 2011

    96,565          

Unrecognized compensation expense

  $ 4,390          

Weighted average remaining period (years)

    2.17