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STOCK BASED COMPENSATION - Summary of Stock Awards Exercised (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
STOCK BASED COMPENSATION |  |  |
Total intrinsic value |  | $ 0 | $ 243
Cash received |  | 0 | 118
Actual tax benefit realized for tax deductions | $ 0 | $ 0 | $ 0

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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901 + Details
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