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STOCK-BASED COMPENSATION - Stock option activity (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	10,834
Exercised (in shares) | shares	10,834
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 18.59
Exercised (in dollars per share) | $ / shares	$ 18.59

X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

+ References

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Number of share options (or share units) exercised during the current period.

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