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EQUITY INCENTIVE PLANS - Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement Compensation Expense Items [Abstract] |  |  |
Stock based compensation expense | $ 1.5 | $ 1.2 | $ 1.2

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