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STOCK-BASED COMPENSATION PLANS - Summary (Details) - Stock Appreciation Rights - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock Appreciation Rights |  |  |
Outstanding (in units) | 91,800 | 116,280 | 116,280
Granted (in units) | 110,160 |  |
Exercised (in units) | (91,800) | (24,480) |
Outstanding (in units) | 110,160 | 91,800 | 116,280
Exercisable (in shares) | 79,560 | 91,800 |
Weighted Average Grant Date Assigned Value |  |  |
Outstanding (in dollars per unit) | $ 5.73 | $ 5.66 | $ 5.66
Granted (in dollars per unit) | 16.32 |  |
Exercised (in dollars per unit) | 5.73 | 5.43 |
Outstanding (in dollars per unit) | 16.32 | 5.73 | $ 5.66
Exercisable (in dollars per unit) | $ 16.32 | $ 5.73 |
Weighted average remaining contractual term | 9 years 8 months 12 days |  |

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- Definition The weighted average fair value at grant date for equity-based awards issued during the period on other than stock (or unit) option plans. + References No definition available. + Details
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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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