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Nature Of Business And Significant Accounting Policies (Schedule Of Estimated Fair Value Of Options) (Details)	12 Months Ended
	Dec. 31, 2012
Common Stock Options And Stock Purchase Plan [Abstract]
Dividend yield	0.00%
Expected volatility	22.98%
Risk free interest rate	2.21%
Expected life	5 years

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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