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Equity Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2013
Compensation Related Costs [Abstract]  
Performance Units
The following table presents a summary of the fair value of the performance units and the related assumptions as of September 30, 2013.
 
 
 
 
Expected price volatility range
32.6
%
-
58.3%
Risk-free interest rate
 
 
0.4%
Fair value per unit
 
 
$80.60