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Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Supplemental Employee Incentive Plan IV
 
Stock-Based Compensation arrangements  
Schedule of Value per Share and Assumptions Used
The following assumptions were used to determine the period-end fair value of the Supplemental Employee Incentive Plan IV liability using a Monte Carlo model:
 
September 30,
2014
Stock price volatility
33.9
%
Risk free rate of return
1.0
%
Annual salary increase rate
4.0
%
Annual turnover rate
4.6
%
TSR Performance Share Awards
 
Stock-Based Compensation arrangements  
Schedule of Value per Share and Assumptions Used
The following assumptions were used to determine the grant date fair value of the equity component (February 20, 2014) and the period-end fair value of the liability component of the TSR Performance Share Awards:
 
 
Grant Date
 
September 30, 2014
Fair value per performance share award
 
$
32.04

 
$7.19 - $25.22

Assumptions:
 
 

 
 

     Stock price volatility
 
41.3
%
 
27.5% - 120.4%

     Risk free rate of return
 
0.7
%
 
0.02% - 0.7%

     Expected dividend yield
 
0.2
%
 
0.2
%