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TAXES - (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Tax benefits for employee stock-based compensation |  |  |
Tax benefit for employee stock-based compensation | $ 866 | $ 657 | $ 785
ASU 2016-09 |  |  |
Tax benefits for employee stock-based compensation |  |  |
Tax benefit for employee stock-based compensation | $ 1,000 | $ 800 | $ 1,400

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