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Share-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions for SARs
We used the following assumptions as part of a binomial lattice-based valuation model to estimate the fair value of the SARs we granted during the 2017 first half:
Expected volatility
30.9
%
Dividend yield
1.3
%
Risk-free rate
2.4
%
Expected term (in years)
8