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Stock-Based Compensation Plans Stock Option Award Assumptions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
14. Stock based comp [Abstract]
Expected volatility	43.50%	0.00%	43.70%
Risk-free interest rate	0.80%	0.00%	2.20%
Expected holding period (in years)	5	0	5
Expected dividends	0.00%	0.00%	0.00%
Weighted average grant date fair value	$ 1.32	$ 0.00	$ 1.16

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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