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Stock and Other Incentive Plans (Details 2)	12 Months Ended
Stock and Other Incentive Plans (Details 2)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair value of options issued based on weighted-average assumptions
Risk-free interest rates	0.25%	0.61%	1.14%
Expected dividend yields	6.17%	5.35%	5.68%
Expected life (in years)	1 year 5 months 16 days	1 year 5 months 23 days	1 year 6 months
Expected volatility	30.30%	64.80%	69.50%
Expected forfeiture rates	70.00%	91.00%	91.00%

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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