Stock Compensation Plans (Weighted Average Grant-Date Fair Value Of SSARS And Assumptions Under Black-Scholes Option Model) (Details) (Settled Stock Appreciation Rights (SSARs) [Member], USD $)	9 Months Ended
Sep. 30, 2012 Y	Sep. 30, 2011 Y
Settled Stock Appreciation Rights (SSARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value	$ 22.50	$ 22.54
Weighted average assumptions under Black-Scholes option model:
Expected life of awards	5.5	5.5
Risk-free interest rate	0.80%	2.00%
Expected volatility	51.00%	49.50%
Expected dividend yield	0.00%	0.00%

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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- Definition

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.

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