Share-Based Compensation (Summary Of Weighted-Average Assumptions Used In The Black-Scholes Option-Pricing Model) (Details) (USD $)	12 Months Ended
Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.70%	2.20%	2.40%
Expected volatility	52.00%	48.00%	48.00%
Expected dividend yield	1.37%	1.24%	1.38%
Expected term (years)	4.91	4.73	4.30
Estimated fair value	$ 11.79	$ 12.64	$ 10.78

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References+ Details

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References+ Details