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STOCKHOLDERS' EQUITY - Activity of the Plans (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Restricted stock and RSU grants |  |  |  |  |  |
Restricted stock and RSU grants (based on grant price): |  |  |  |  |  |
Weighted average per share value of non-vested shares (in dollars per share) |  | $ 25.91 | $ 26.26 | $ 25.91 | $ 26.26 |
Value of stock vested during the period |  |  |  | $ 5,165,000 | $ 5,535,000 |
Weighted average per share value of shares forfeited during the period (in dollars per share) |  | $ 25.85 | $ 0 | $ 25.47 | $ 29.12 |
Total charge to operations: |  |  |  |  |  |
Total charge to operations |  | $ 1,211,000 | $ 1,306,000 | $ 4,103,000 | $ 4,190,000 |
Restricted stock grants |  |  |  |  |  |
Summary of the activity of the incentive Plans |  |  |  |  |  |
Average per share grant price (in dollars per share) |  |  |  | $ 22.09 | $ 33.75 |
Deferred compensation to be recognized over vesting period |  | $ 3,379,000 | $ 5,183,000 | $ 3,379,000 | $ 5,183,000 |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 712,920 | 712,375 | 712,375 | 706,450 | 706,450
Number of shares granted |  |  |  | 152,955 | 153,575 |
Vested during period (in shares) |  |  |  | (152,300) | (146,900) |
Forfeitures (in shares) |  | (260) |  | (370) | (750) |
Non-vested end of period (in shares) | 712,920 | 712,660 | 712,375 | 712,660 | 712,375 | 712,375
Total charge to operations: |  |  |  |  |  |
Total charge to operations |  | $ 923,000 | $ 951,000 | $ 3,051,000 | $ 3,106,000 |
Weighted average vesting period |  |  |  | 2 years 3 months 18 days |  |
Restricted stock grants | General and administrative expense |  |  |  |  |  |
Total charge to operations: |  |  |  |  |  |
Total compensation costs related to non-vested awards that have not yet been recognized |  | $ 8,557,000 |  | $ 8,557,000 |  |
Restricted stock units |  |  |  |  |  |
Summary of the activity of the incentive Plans |  |  |  |  |  |
Average per share grant price (in dollars per share) |  | $ 20.32 | $ 26.44 | $ 20.32 | $ 26.44 |
Deferred compensation to be recognized over vesting period |  | $ 979,000 | $ 1,352,000 | $ 979,000 | $ 1,352,000 |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 166,050 | 155,726 | 241,076 | 230,752 | 230,752
Number of shares granted |  | 85,250 | 85,350 | 85,250 | 85,350 |
Vested during period (in shares) | (74,988) |  |  | (74,988) | (64,488) |
Forfeitures (in shares) | (38) |  |  | (38) | (10,538) |
Non-vested end of period (in shares) | 166,050 | 251,300 | 241,076 | 251,300 | 241,076 | 241,076
Total charge to operations: |  |  |  |  |  |
Total charge to operations |  | $ 288,000 | $ 355,000 | $ 1,052,000 | $ 1,084,000 |
Weighted average vesting period |  |  |  | 1 year 9 months 18 days |  |
Restricted stock units | General and administrative expense |  |  |  |  |  |
Total charge to operations: |  |  |  |  |  |
Total compensation costs related to non-vested awards that have not yet been recognized |  | $ 2,184,000 |  | $ 2,184,000 |  |

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