STOCK COMPENSATION PLAN - Narrative (Details) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares reserved for issuance (in shares)	6,565,000	6,565,000
Shares remaining available for grants (in shares)	2,700,000	2,700,000
Term of plan		7 years
Time-Based Restricted Stock Units (RSU) Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense \| $		$ 2.7
Deferred compensation liability \| $	$ 8.4	$ 8.4
Restricted Stock, Vested (in shares)		0
Performance-Based Restricted Stock Units (RSU) Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense \| $		$ 2.7
Deferred compensation liability \| $	$ 8.4	$ 8.4
Award vesting rights, target percentage		100.00%
Restricted Stock, Vested (in shares)		0
Performance-Based Restricted Stock Units (RSU) Awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		0.00%
Performance-Based Restricted Stock Units (RSU) Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		150.00%
2018 Long Term Incentive Program \| Time-based and Performance-based RSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	811,010
2018 Long Term Incentive Program \| Time-Based Restricted Stock Units (RSU) Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		405,505
Weighted Average Grant Date Fair Value, Granted (in dollars per share) \| $ / shares		$ 19.05
Vesting period	3 years
2018 Long Term Incentive Program \| Performance-Based Restricted Stock Units (RSU) Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		405,505
Weighted Average Grant Date Fair Value, Granted (in dollars per share) \| $ / shares		$ 19.05
Vesting period	3 years
2017 Long Term Incentive Program \| Time-based and Performance-based RSU Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	325,894
2017 Long Term Incentive Program \| Time-Based Restricted Stock Units (RSU) Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		162,947
Weighted Average Grant Date Fair Value, Granted (in dollars per share) \| $ / shares		$ 19.70
Vesting period	2 years
2017 Long Term Incentive Program \| Performance-Based Restricted Stock Units (RSU) Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)		162,947
Weighted Average Grant Date Fair Value, Granted (in dollars per share) \| $ / shares		$ 19.70
Vesting period	2 years

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Stock Compensation Plan, Term

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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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.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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