SHARE-BASED COMPENSATION - Weighted Average Assumptions Used in Estimating the Value of Performance Share Units (Details) (Performance share units, USD $)	12 Months Ended
Dec. 31, 2013
2013 grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1/1/2013 – 12/31/2014
Valuation date closing stock price	$ 30.48
Expected dividends	2.23%
Risk-free rate minimum	0.09%
Risk-free rate maximum	0.46%
Volatility minimum	22.09%
Volatility maximum	29.57%
2012 grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1/1/2012 – 12/31/2013
Valuation date closing stock price	$ 20.56
Expected dividends	2.92%
Risk-free rate minimum	0.08%
Risk-free rate maximum	0.32%
Volatility minimum	34.66%
Volatility maximum	34.86%
2011 grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	1/1/2011 – 12/31/2012
Valuation date closing stock price	$ 24.32
Expected dividends	0.82%
Risk-free rate minimum	0.12%
Risk-free rate maximum	0.80%
Volatility minimum	28.65%
Volatility maximum	35.74%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The estimated measure of the maximum 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.

+ References

No definition available.

+ Details

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- Definition

The estimated measure of the minimum 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.

+ References

No definition available.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Performance Period.

+ References

No definition available.

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