SHARE-BASED COMPENSATION - Additional Information (Details) shares in Thousands, $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($) perfconditions shares	Jun. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding to officers, directors and key employees (in shares) \| shares	1,600
Total number of shares authorized to be issued under Equity Incentive Plan \| shares	1,200
Share-based compensation	$ 6.1	$ 7.0
Unrecognized compensation expense related to share-based compensation	$ 16.2
Remaining weighted-average period	2 years 1 month
Stock and stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 3.6	5.2
Award vesting period	4 years
Granted \| shares	45
Long-term performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 2.5	$ 1.8
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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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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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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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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Number of shares authorized for issuance under share-based payment arrangement.

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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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