Stock Compensation Plans and Stock Based Compensation (Details 2) (USD $)	12 Months Ended
Dec. 31, 2011 Years	Jan. 01, 2011 Years	Jan. 02, 2010 Years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Dividend yield
Expected volatility	44.90%	45.90%	65.80%
Risk-free interest rate	2.18%	2.45%	1.91%
Expected term (in years)	4.7	4.6	4.5
Weighted-average fair value of options granted	$ 3.93	$ 2.51	$ 2.33

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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