SHARE-BASED COMPENSATION - Additional Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($) perfconditions shares	Mar. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding to officers, directors and key employees (in shares) \| shares	1,600,000
Total number of shares authorized to be issued under Equity Incentive Plan \| shares	450,000
Share-based compensation	$ 2.4	$ 2.4
Unrecognized compensation expense related to share-based compensation	$ 21.2
Remaining weighted-average period	2 years 2 months
Stock and stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 1.5	1.7
Award vesting period	4 years
Granted \| shares	0
Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 0.9	$ 0.7
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award contractual term	10 years
2018 and 2019 \| Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Share-based compensation award, number of performance conditions \| perfconditions	2
Performance period	2 years
2018 and 2019 \| Long-term performance stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	0.00%
2018 and 2019 \| Long-term performance stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Possible payouts	200.00%

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Outstanding

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Share-based compensation arrangement by sharebased payment award possible payout percentage.

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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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Unrecognized cost of unvested share-based compensation awards.

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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.

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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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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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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