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STOCKHOLDERS' EQUITY - Activity of the Plans (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 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) | $ 26.45 | $ 26.45 | $ 26.25 | $ 26.45 | $ 26.25 |
Value of stock vested during the period |  | $ 1,753,000 | $ 2,299,000 | $ 5,165,000 | $ 5,535,000 |
Weighted average per share value of shares forfeited during the period (in dollars per share) |  | $ 24.80 | $ 28.91 | $ 24.80 | $ 29.12 |
Total charge to operations: |  |  |  |  |  |
Total charge to operations |  | $ 1,564,000 | $ 1,559,000 | $ 2,892,000 | $ 2,884,000 |
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 | $ 3,379,000 | $ 5,183,000 | $ 3,379,000 | $ 5,183,000 |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 730,530 | 728,775 | 712,375 | 706,450 | 706,450
Number of shares granted |  |  |  | 152,955 | 153,575 |
Vested during period (in shares) |  | (17,500) | (16,150) | (152,300) | (146,900) |
Forfeitures (in shares) |  | (110) | (250) | (110) | (750) |
Non-vested end of period (in shares) | 712,920 | 712,920 | 712,375 | 712,920 | 712,375 | 712,375
Total charge to operations: |  |  |  |  |  |
Total charge to operations |  | $ 1,178,000 | $ 1,197,000 | $ 2,128,000 | $ 2,154,000 |
Weighted average vesting period |  |  |  | 2 years 7 months 6 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 | $ 9,487,000 | $ 9,487,000 |  | $ 9,487,000 |  |
Restricted stock units |  |  |  |  |  |
Summary of the activity of the incentive Plans |  |  |  |  |  |
Average per share grant price (in dollars per share) |  | $ 0 | $ 0 | $ 0 | $ 0 |
Deferred compensation to be recognized over vesting period | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) |  | 241,076 | 230,752 | 241,076 | 230,752 | 230,752
Number of shares granted |  | 0 | 0 | 0 | 0 |
Vested during period (in shares) | (74,988) | (74,988) | (64,488) | (74,988) | (64,488) |
Forfeitures (in shares) | (38) | (38) | (10,538) | (38) | (10,538) |
Non-vested end of period (in shares) | 166,050 | 166,050 | 155,726 | 166,050 | 155,726 | 241,076
Total charge to operations: |  |  |  |  |  |
Total charge to operations |  | $ 386,000 | $ 362,000 | $ 764,000 | $ 730,000 |
Weighted average vesting period |  |  |  | 1 year 6 months |  |
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 | $ 1,670,000 | $ 1,670,000 |  | $ 1,670,000 |  |

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