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STOCK-BASED COMPENSATION - NARRATIVE (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2017
2017 LTIP |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  | 2,467,430
2017 LTIP | Performance stock units |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Distribution of shares to recipients (in shares) |  | 0 |  |
2017 LTIP | Performance stock units | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Ratio at which award holders get common stock of the company | 0 |  |  |
2017 LTIP | Performance stock units | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Ratio at which award holders get common stock of the company | 2 |  |  |
2021 LTIP |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Shares reserved for future issuance (in shares) |  |  | 700,000 |
LTIP |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Granted (in shares) | 0 |  |  |
Exercised in period, aggregate intrinsic value | $ 0.2 |  |  |
LTIP | Restricted stock units |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Number of shares released upon vesting (in shares) | 1 |  |  |
Vesting period | 3 years |  |  |
Granted (in shares) | 178,567 |  |  |
Granted, fair value | $ 6.1 |  |  |
LTIP | Restricted stock units | 2019 |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting percent of shares | 33.00% |  |  |
LTIP | Restricted stock units | 2020 |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting percent of shares | 33.00% |  |  |
LTIP | Restricted stock units | 2021 |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting percent of shares | 33.00% |  |  |
LTIP | Performance stock units |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Vesting period | 3 years |  |  |
Granted (in shares) | 64,258 |  |  |
Granted, fair value | $ 4.4 |  |  |
Number of trading days | 30 days |  |  |
LTIP | Performance stock units | Minimum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Ratio at which award holders get common stock of the company | 0 |  |  |
LTIP | Performance stock units | Maximum |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Ratio at which award holders get common stock of the company | 2 |  |  |
LTIP | Stock options |  |  |  |
STOCK-BASED COMPENSATION |  |  |  |
Expiration period | 10 years |  |  |
Granted (in shares) | 0 |  |  |

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