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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
Awards granted during the first six months of 2014 and assumptions used to determine fair value were as follows:
 
MSUs
 
Performance Shares
 
RSUs
Awards granted
364,180

 
111,287

 
55,000

Weighted average fair value
$
40.20

 
$
46.46

 
$
33.53

Expected volatility
54.93
%
 
54.93
%
 
N/A

Risk-free rate (a)
0.63
%
 
0.63
%
 
N/A

Expected term (in years) (b)
2.94

 
2.94

 
N/A

Expected dividends

 

 
N/A

(a) The risk-free rate was based on zero coupon U.S. government issues at the time of grant.
(b) The expected term represents the period from the valuation date to the end of the performance period.