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Share-Based Payments (Schedule Of Weighted Average Valuation Assumptions) (Details)	3 Months Ended
	Mar. 31, 2013
Share-Based Payments [Abstract]
Expected term (in years)	6 years 3 months 18 days
Expected stock price volatility	40.00%
Risk-free interest rate	1.20%
Expected dividend yield	0.00%

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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