Share Based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Weighted average estimated fair value

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