STOCK PLANS AND SHARE BASED COMPENSATION (Fair Value Assumptions) (Details) (Employees Stock Purchase Plan [Member], USD $)	3 Months Ended
Mar. 31, 2012 years	Mar. 31, 2011 years
Employees Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.09%	0.17%
Expected volatility rates	48.00%	37.00%
Expected dividend yield	0.54%	0.51%
Expected term of purchase right (years)	0.5	0.5
Weighted-average estimated fair value of purchase rights	$ 10.42	$ 9.40

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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