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Share Based Compensation (Tables)
9 Months Ended
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Weighted Average Estimated Fair Value [Table Text Block]
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