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EMPLOYEE BENEFIT PLANS - Activity in Liability Classified Shares (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Liability Classified Awards Settleable in Shares |  |  |  |  |  |
Beginning balance |  | $ 20,989 | $ 15,493 | $ 20,989 | $ 21,676 | $ 15,493
Offer to grant | $ 5,189 |  |  |  | 6,410 | 12,432
Share price determined-converted to cash payments | (249) |  |  |  | (100) | (300)
Share price determined-transferred to equity grants | (7,223) |  |  |  | (6,457) | (4,705)
Forfeited | (1,756) |  |  |  | (540) | (1,244)
Ending balance | $ 16,950 |  |  | $ 16,950 | $ 20,989 | $ 21,676
Share price determined-transferred to equity grants (in shares) |  | 134,370 | 96,778 | 121,075 |  |

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