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STOCK COMPENSATION PLANS (Purcahse rights assumption) (Details) (Employee Stock Purchase Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Expected Life (in years)	6 months	6 months
Average Dividend Yield (in hundredths)	3.42%	2.79%
Average Expected Volatility (in hundredths)	13.99%	20.02%
Average Risk-Free Rate of Return (in hundredths)	0.11%	0.22%
Weighted-Average Fair Value	$ 2.82	$ 2.55

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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