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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of outstanding stock maximum | 4.50% |  |
Number of shares available for issuance (in shares) | 8,137,941 |  |
Granted (in shares) | 0 |  |
Unrecognized compensation compensation, not yet recognized | $ 100 |  |
Proceeds from exercise of stock options | 8,778 | $ 6,545 | $ 7,875
Proceeds from stock options exercised, tax benefit | $ 1,300 |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Expiration period | 7 years |  |
Unrecognized compensation compensation, not yet recognized, period | 10 months 24 days |  |
Deferred share units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of automatic redemption | 50.00% |  |
Cash used to settle award | $ 2,700 | 3,100 | 0
Granted and vested, fair value | $ 1,400 | 10,700 | 1,900
RSUs and RSU Replacement Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Unrecognized compensation compensation, not yet recognized, period | 2 years 10 months 24 days |  |
Cash used to settle award | $ 0 | 4,600 | 900
Granted, fair value | 7,200 | 25,400 | 2,700
Vested, fair value | 3,300 | 14,100 | 1,600
Unrecognized compensation compensation, not yet recognized | $ 2,900 |  |
RSUs and RSU Replacement Units | Alacer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
PSUs and PSU Replacement Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation compensation, not yet recognized, period | 2 years 3 months 18 days |  |
Cash used to settle award | $ 14,300 | 12,000 | 4,100
Granted, fair value | 11,500 | 24,800 | 2,400
Vested, fair value | 17,400 | $ 4,400 | $ 2,000
Unrecognized compensation compensation, not yet recognized | $ 4,900 |  |
PSUs and PSU Replacement Units | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance target, percentage | 0.00% |  |
PSUs and PSU Replacement Units | Minimum | Alacer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance target, percentage | 0.00% |  |
PSUs and PSU Replacement Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance target, percentage | 200.00% |  |
PSUs and PSU Replacement Units | Maximum | Alacer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance target, percentage | 200.00% |  |

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