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SHARE-BASED COMPENSATION - Weighted Average Assumptions Used to Re-measure the Value of Stock Appreciation Rights at Year-End (Details) (Stock appreciation rights, USD $)	12 Months Ended
	Dec. 31, 2012
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	29.07%
Expected dividends	2.44%
Expected term (in years)	1 year 259 days
Risk-free rate	0.27%
Weighted average fair value	$ 7.25

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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