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STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 16, 2020 | Mar. 31, 2020 | May 31, 2018 | Apr. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
RSUs |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Eligible to vest (in shares) | 462,963 | 5,748,331 |  |  | 5,748,331 | 2,790,060
Fair market value on date of grant | $ 1.0 |  |  |  |  |
Maximum number of shares to be settled (in shares) | 4,750,000 |  |  |  |  |
Granted (in shares) |  |  |  |  | 4,123,151 |
Vested (in shares) |  |  |  |  | 927,062 |
Grant date fair value (in dollars per share) |  | $ 3.10 |  |  | $ 3.10 | $ 5.11
PSUs |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Eligible to vest (in shares) |  | 5,238,930 |  |  | 5,238,930 | 1,067,073
Granted (in shares) |  |  |  | 872,073 | 4,847,500 |
Vested (in shares) |  |  |  |  | 315,866 |
Grant date fair value (in dollars per share) |  | $ 2.52 |  |  | $ 2.52 | $ 5.94
PSUs | Market PSUs |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Granted (in shares) |  |  |  | 348,829 |  |
Percent of performance metrics achieved |  |  |  |  | 200.00% |
Performance period (in years) |  |  |  |  | 3 years |
PSUs | Performance PSUs |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Granted (in shares) |  |  |  | 523,244 |  |
Achievement level (as a percentage) |  | 30.493% |  |  |  |
Percent of performance metrics achieved |  |  |  |  | 200.00% |
PSUs | 2018 Performance Share Units |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Grant date fair value (in dollars per share) |  | $ 2.16 |  |  | $ 2.16 |
PSUs | Executives | 2018 Performance Share Units |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Granted (in shares) |  |  | 195,000 |  |  |
Percent of performance metrics achieved |  |  | 150.00% |  |  |
Vested (in shares) |  |  | 292,500 |  |  |

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- Definition Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Grant Date Fair Value + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Percent of Performance Metrics Achieved + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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