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STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Summary of stock based compensation agreements |  |  |  |
Unrecognized stock-based compensation cost |  |  | $ 35,022 | $ 22,687
Weighted average years expense recognition period |  | 2 years 3 days | 2 years 1 month 24 days |
Total stock-based awards outstanding (in shares) | [1] |  | 932,589 | 1,098,545
Payout percentage |  |  | 100.00% |
[1] | Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.

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