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STOCK-BASED COMPENSATION PLANS - Summary (Details) - Performance Shares - $ / shares | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Units |  |  |  |  |
Outstanding (in units) | 42,840 | 91,800 | 91,800 | 116,280 |
Granted (in units) | 110,160 |  | 110,160 |  |
Exercised (in units) | (42,840) |  | (91,800) | (24,480) |
Outstanding (in units) | 110,160 | 91,800 | 110,160 | 91,800 |
Exercisable (in shares) | 79,560 |  | 79,560 |  | 91,800
Weighted Average Grant Date Assigned Value |  |  |  |  |
Outstanding (in dollars per unit) | $ 7.46 | $ 5.73 | $ 5.73 | $ 5.66 |
Granted (in dollars per unit) | 25.75 |  | 25.75 |  |
Exercised (in dollars per unit) | 7.46 |  | 5.73 | 5.43 |
Outstanding (in dollars per unit) | 25.75 | $ 5.73 | 25.75 | $ 5.73 |
Exercisable (in dollars per unit) | $ 25.75 |  | $ 25.75 |  | $ 5.73

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