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STOCK-BASED COMPENSATION PLANS - Summary (Details) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Restricted Stock Units |  |
Stock Appreciation Rights |  |
Granted (in units) | 73,150 |
Outstanding (in units) | 73,150 |
Weighted Average Grant Date Assigned Value |  |
Granted (in dollars per unit) | $ 19.03 |
Outstanding (in dollars per unit) | $ 19.03 |
Weighted average remaining contractual term | 3 years 8 months 12 days |
Stock Appreciation Rights |  |
Stock Appreciation Rights |  |
Outstanding (in units) | 110,160 | 91,800
Granted (in units) |  |
Outstanding (in units) | 110,160 | 91,800
Exercisable (in shares) | 79,560 |
Weighted Average Grant Date Assigned Value |  |
Outstanding (in dollars per unit) | $ 16.32 | $ 5.73
Outstanding (in dollars per unit) | $ 16.32 | $ 5.73
Weighted average remaining contractual term | 9 years 4 months 24 days |

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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