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Share-Based Compensation
3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-Based Compensation
Share-Based Compensation

During the three months ended March 31, 2017, we granted 354,400 non-qualified employee stock options, 49,840 restricted stock units, 63,710 performance shares, and 6,121 phantom stock units. For the three months ended March 31, 2017, 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, 2016, total share-based compensation expense was $3.0 million and the related tax benefits were $1.1 million.
The estimated fair value of our 2017 stock option awards and related underlying assumptions are shown in the table below.
 
2017
Estimated fair value, including present value of dividends
$
19.40

Quarterly dividend rate
$
0.42

Expected term of stock option awards, in years
4.7

Risk-free interest rate
1.9
%
Dividend yield
2.8
%
Expected stock price volatility
27.7
%
Present value of dividends
$
7.50