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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Document Period End Date |  |  | Jun. 30, 2021 |  |
Share based compensation expense | $ 27,646 | $ 34,318 | $ 55,927 | $ 62,264 |
Share based compensation - Unrecognized deferred compensation cost | 160,592 |  | 160,592 |  |
Carry Unit Plan | Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average fair value (in dollars per unit) |  |  |  |  | $ 3.89
Share based compensation expense | 44 | 3,937 | 803 | 7,057 |
Share based compensation - Unrecognized deferred compensation cost | 0 |  | 0 |  |
2017 LTIP | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation expense | 24,473 | 25,327 | 48,696 | 45,676 |
Share based compensation - Unrecognized deferred compensation cost | 102,654 |  | 102,654 |  |
2017 LTIP | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation expense | 2,868 | 4,419 | 5,850 | 8,320 |
Share based compensation - Unrecognized deferred compensation cost | 57,633 |  | 57,633 |  |
2019 LTIP | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share based compensation expense | 261 | $ 635 | 578 | $ 1,211 |
Share based compensation - Unrecognized deferred compensation cost | $ 305 |  | $ 305 |  |

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