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STOCK-BASED COMPENSATION PLANS - Executive Equity Arrangements (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2020 USD ($) shares | Mar. 31, 2020 $ / shares | May 31, 2018 shares | Apr. 30, 2019 shares | Sep. 30, 2020 $ / shares shares | Sep. 30, 2020 $ / shares shares | Sep. 30, 2020 performancePeriod $ / shares shares | Jun. 30, 2020 $ / shares | Dec. 31, 2019 $ / shares shares
Performance PSUs |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 133,333 |  |
RSUs |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Eligible to vest (in shares) | 462,963 |  |  |  | 6,931,663 | 6,931,663 | 6,931,663 |  | 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) |  |  |  |  |  |  | 6,486,016 |  |
Vested (in shares) |  |  |  |  |  |  | 1,667,289 |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 3.30 | $ 3.30 | $ 3.30 |  | $ 5.11
PSUs |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Eligible to vest (in shares) |  |  |  |  | 6,169,770 | 6,169,770 | 6,169,770 |  | 1,067,073
Granted (in shares) |  |  |  | 872,073 |  | 823,369 | 5,804,202 |  |
Vested (in shares) |  |  |  |  |  |  | 323,752 |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 1.67 | $ 1.67 | $ 1.67 |  | $ 5.94
PSUs | Performance PSUs |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Maximum number of shares to be settled (in shares) |  |  |  |  | 43,000 |  |  |  |
Granted (in shares) |  |  |  | 523,244 |  | 494,020 |  |  |
Number of performance periods | performancePeriod |  |  |  |  |  |  | 3 |  |
Percent of performance metrics achieved |  |  |  |  |  |  | 200.00% |  |
Achievement level (as a percentage) |  | 30.493% |  |  |  |  |  |  |
Service period |  |  |  |  |  |  | 3 years |  |
PSUs | Market PSUs |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 348,829 |  | 329,349 |  |  |
Percent of performance metrics achieved |  |  |  |  |  |  | 200.00% |  |
Performance period (in years) |  |  |  |  |  |  | 3 years |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 4.24 | $ 4.24 | $ 4.24 | $ 4.37 |
PSUs | 2018 Performance Share Units |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  | $ 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 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. + 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=120381028&loc=d3e5070-113901 + Details
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