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Share-Based Compensation
3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
Share-Based Compensation
During the first three months of 2013, we granted 316,500 stock appreciation rights (“SARs”), 63,980 restricted stock units, 68,780 performance shares, and 5,253 phantom stock units. For the three months ended March 31, 2013, total share-based compensation expense was $3.2 million, and the related tax benefits were $1.2 million. For the three months ended March 31, 2012, total share-based compensation expense was $3.1 million, and the related tax benefits were $1.1 million.
The weighted average estimated fair value of our 2013 SARs awards and our related underlying assumptions are shown in the table below.
 
2013
Weighted average estimated fair value
$
18.89

Quarterly dividend rate
$
0.30

Expected term of SARs, in years
4.7

Risk-free interest rate
0.7
%
Dividend yield
2.6
%
Expected stock price volatility
42.4
%
Present value of dividends
$
5.60