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Stock Plans (Fair Value of Stock Options Weighted-Average Assumptions) (Details) (Stock Options [Member])	12 Months Ended
	Dec. 31, 2010
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividends	0.00%
Expected volatility range	69.50%
Risk-free interest rate range	2.40%
Expected term/life (in years)	4 years 9 months 18 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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