Share Based Compensation, 401(k) Plan and Deferred Compensation (Weighted-Average Assumptions) (Details)	12 Months Ended
Dec. 31, 2011 Years	Dec. 31, 2010 Years
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	2.86%	3.03%
Dividend yield	5.01%	6.53%
Volatility factor	48.02%	46.89%
Weighted-average expected life	7	7

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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