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SHARE-BASED COMPENSATION PLANS - Non-vested stock options (Details) - Non Vested Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding at beginning of year	473,740	481,613
Number of Options, Granted	188,600	192,650
Number of Options, Vested	(165,824)	(193,838)
Number of Options, Forfeited	(11,145)	(6,685)
Number of Options, Outstanding at end of year	485,371	473,740
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share)	$ 27.77	$ 29.46
Weighted Average Exercise Price, Granted (in dollars per share)	18.00	23.45
Weighted Average Exercise Price, Vested (in dollars per share)	27.48	27.59
Weighted Average Exercise Price, Forfeited (in dollars per share)	27.54	29.94
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share)	24.08	27.77
Weighted Average Fair Value, Outstanding at beginning of year (in dollars per share)	4.26	4.49
Weighted Average Fair Value, Granted (in dollars per share)	2.01	3.32
Weighted Average Fair Value, Vested (in dollars per share)	3.99	3.87
Weighted Average Fair Value, Forfeited (in dollars per share)	4.27	4.87
Weighted Average Fair Value, Outstanding at end of the year (in dollars per share)	$ 3.48	$ 4.26

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the non-vested stock option plan.

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