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Significant Accounting Policies (Schedule Of Weighted Average Assumptions To Determine The Fair Value Of Stock Option Grants) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Abstract]
Dividend yield	3.90%	2.79%	2.72%
Expected life (years)	7 years 4 months 24 days	7 years 1 month 6 days	7 years 1 month 6 days
Expected volatility	53.00%	52.00%	52.00%
Risk-free rate	1.27%	2.71%	2.69%
Weighted average grant date fair value of options granted	$ 4.39	$ 4.65	$ 5.24

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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