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Equity Incentive Plan Details 2 (Details)	12 Months Ended
Equity Incentive Plan Details 2 (Details)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Option Pricing Model Assumptions [Abstract]
Risk Free Interest Rate	0.71%	1.09%	1.17%
Expected Term	5 years	5 years	5 years
Expected Volatility Rate	30.00%	30.00%	30.00%
Expected Dividend Rate	0.00%	0.00%	0.00%

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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