STOCK-BASED COMPENSATION - PSUs (Details) - Performance Shares $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) day $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted \| shares	63,538	72,040
Weighted average grant date fair value (in USD per share) \| $ / shares	$ 35.64	$ 28.05
Share-based compensation arrangement by share-based payment award, fair value assumptions, threshold trading days \| day	20
Share-based compensation by share-based payment award, fair value assumptions, total stockholder return period	3 years
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected volatility rate	19.90%	19.30%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate	0.00%	0.00%
Share-based compensation arrangement by share-based payment award, compensation cost \| $	$ 1.4	$ 0.7
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, multiplier, percentage	0
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, multiplier, percentage	2
One-Year Treasury Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate	1.52%	54.00%
Three-Year Treasury Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, fair value assumptions, risk free interest rate	1.67%	0.91%

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Multiplier, Percentage

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Threshold Trading Days

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- Definition

Share-based Compensation by Share-based Payment Award, Fair Value Assumptions, Total Stockholder Return Period

+ References

No definition available.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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.

+ References

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)
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Net number of non-option equity instruments granted to participants.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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