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STOCK-BASED COMPENSATION - Narrative (Details) - Restricted Stock - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentages of vesting for one year | 100.00% |  |
Percentages of vesting for three years | 50.00% |  |
Percentages of vesting for five years | 33.30% |  |
Percentages of vesting for ten years | 20.00% |  |
Percentages of vesting in period five | 10.00% |  |
Number of shares available for future grant (in shares) | 272,510 |  |
Stock compensation expense | $ 1.5 | $ 1.4 |
Related income tax benefits recognized in earnings | 0.4 | $ 0.6 |
Unrecognized compensation expense | $ 4.1 |  | $ 1.6
Compensation cost not yet recognized, period for recognition | 23 months 15 days |  |
Non-Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 1 year |  |

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