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SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 19, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 20, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted average period over which compensation costs are expected to be recognized |  | 1 year 6 months |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense |  | $ 3.5 | $ 2.0 | $ 2.1 |
Income tax benefit recognized in earnings for benefit compensation |  | 0.9 | 0.5 | 0.5 |
2016 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized for issuance (in shares) | 1,000,000 |  |  |  | 500,000
Increase in number of shares authorized for grant (in shares) | 500,000 |  |  |  |
Unrecognized compensation expense |  | $ 2.2 | $ 3.0 | $ 3.6 |
2016 Plan | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Percentages of vesting for one year |  | 100.00% |  |  |
Percentages of vesting for two years |  | 50.00% |  |  |
Percentages of vesting for three years |  | 33.30% |  |  |
Percentages of vesting for five years |  | 20.00% |  |  |
Percentages of vesting for ten years |  | 10.00% |  |  |
Number of shares available for future grant (in shares) |  | 612,692 |  |  |
2016 Plan | Restricted Stock | Non-Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 1 year |  |  |
2016 Plan | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized for issuance (in shares) | 1,000,000 |  |  |  |

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