Significant Accounting Policies (Weighted Average Assumptions To Determine The Fair Value Of Stock Option Grants) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Significant Accounting Policies [Abstract]
Dividend yield	2.79%	2.72%	2.23%
Expected life (years)	7.1	7.1	7.3
Expected volatility	52.00%	52.00%	46.00%
Risk-free rate	2.71%	2.69%	2.18%
Weighted average grant date fair value of options granted	$ 4.65	$ 5.24	$ 3.65

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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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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