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STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Summary of stock based compensation agreements |  |
Unrecognized stock-based compensation cost | $ 22,687 | $ 22,341
Weighted average years expense recognition period | 2 years 3 days | 1 year 8 months 12 days
Total equity awards outstanding (in shares) | 1,098,545 | 1,240,529
Payout percentage | 100.00% |

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