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STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Summary of stock based compensation agreements |  |  |  |
Unrecognized stock-based compensation cost |  |  | $ 26,568 | $ 22,341
Weighted average years expense recognition period |  | 1 year 8 months 12 days | 2 years 3 months 7 days |
Total stock-based awards outstanding (in shares) | [1] |  | 1,101,671 | 1,240,529
Payout percentage |  |  | 100.00% |
[1] | Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.

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