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Long-Term Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2011
Long-Term Incentive Plan [Abstract]  
Schedule of performance-based restricted stock units
                 
        Weighted
        Average Grant
    Shares
  Date Fair Value
    (#)   ($)
 
Outstanding units at December 31, 2010
           
Granted at target level
    78,131       58.83  
Adjustments above/(below) target level
    7,813       58.83  
Expired
           
Forfeited
           
                 
Outstanding units at June 30, 2011
    85,944       58.83  
                 
Vested units at June 30, 2011
             
Unvested units at June 30, 2011
    85,944          
Unrecognized compensation expense
  $ 4,621          
Weighted average remaining period (years)
    2.67