STOCK-BASED COMPENSATION - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2019 $ / shares	Jun. 30, 2019 USD ($) plan $ / shares 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) \| shares		202,752
Options, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 18.74
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation costs \| $		$ 6.2
Weighted-average period for cost recognition		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 \| Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable, vesting period		1 year
Stock options \| Employees
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		6 years
Stock options \| Directors and Certain Executive Officers \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period		10 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 \| $		$ 29.8
Weighted-average period for cost recognition		2 years
Awards granted during the period (in shares) \| shares		254,268
Other than options, weighted average grant date fair value (in dollars per share) \| $ / shares		$ 54.72
Performance stock and Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite service periods of awards		3 years
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted during the period (in shares) \| shares		118,903
Other than options, weighted average grant date fair value (in dollars per share) \| $ / shares		$ 55.91

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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).

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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.

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