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Compensation Plans (Schedule of Assumptions Used to Estimate Fair Value) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	2.90%	0.00%
Expected volatility	44.20%	40.00%
Risk free rate of return	4.00%	4.00%
Expected lives	2 years 10 months 24 days	6 years 8 months 12 days

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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