STOCK-BASED COMPENSATION - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) plan shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of plans \| plan	2
Grants in period, net of forfeitures (in shares)	139,938
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs \| $	$ 6.3
Weighted-average period for cost recognition	3 years
Stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable, vesting period	3 years
Stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable, vesting period	4 years
Stock options \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable, vesting period	1 year
Stock options \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	8 years
Stock options \| Directors and certain executive officers \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	8 years
Stock options \| Directors and certain executive officers \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Performance stock and Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods of awards	3 years
Restricted stock awards/stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable, vesting period	3 years
Total unrecognized compensation costs \| $	$ 33.3
Weighted-average period for cost recognition	2 years
Awards granted during the period (in shares)	223,571
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during the period (in shares)	119,459

Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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The number of grants made 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).

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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.

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Net number of share options (or share units) granted during the period.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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