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STOCK-BASED COMPENSATION - Stock option activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Beginning balance (in shares)	10,834	369,483
Exercised (in shares)	10,834	358,649
Ending balance (in shares)		10,834
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 18.59	$ 26.40
Exercised (in dollars per share)	$ 18.59	26.63
Ending balance (in dollars per share)		$ 18.59

X

- Definition

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

+ References

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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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

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