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STOCK-BASED COMPENSATION - Summary of stock option activity (Details) - Time Based [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of period | shares	185
Exercised | shares	(32)
Expired | shares	(4)
Outstanding at ending of period | shares	149
Weighted-Average Exercise Price Per Share, Beginning Balance | $ / shares	$ 21.56
Weighted-Average Exercise Price Per Share, Exercised | $ / shares	13.39
Weighted-Average Exercise Price Per Share, Expired | $ / shares	15.58
Weighted-Average Exercise Price Per Share, End Balance | $ / shares	$ 23.48

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
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Weighted average price of options that were either forfeited or expired.

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

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

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