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Share-Based Compensation
6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
Share-Based Compensation

During the first six months of 2014, we granted 295,000 stock appreciation rights (“SARs”), 55,360 restricted stock units, 62,670 performance shares, and 7,688 phantom stock units. For the three and six months ended June 30, 2014, total share-based compensation expense was $3.1 million and $6.2 million and the related tax benefits were $1.2 million and $2.3 million. For the three and six months ended June 30, 2013, total share-based compensation expense was $3.2 million and $6.4 million and the related tax benefits were $1.2 million and $2.4 million.
The estimated fair value of our 2014 SARs awards and related underlying assumptions are shown in the table below.
 
2014
Estimated fair value
$
18.90

Quarterly dividend rate
$
0.33

Expected term of stock appreciation rights, in years
4.4

Risk-free interest rate
1.3
%
Dividend yield
2.3
%
Expected stock price volatility
30.3
%
Present value of dividends
$
5.76