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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |  |  |  |
Stock based compensation | $ 1,184 | $ 1,063 | $ 3,747 | $ 3,209
Stock swaps equity instruments received (in shares) | 37,049 | 16,140 | 59,104 | 29,149
Stock swaps (in shares) | 13,285 | 10,610 | 39,312 | 32,637

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