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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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) | $ 26.26 | $ 25.04 | $ 24.98 |
Value of stock vested during the period | $ 5,535,000 | $ 5,165,000 | $ 3,589,000 |
Weighted average per share value of shares forfeited during the period (in dollars per share) | $ 29.12 | $ 24.62 | $ 24.03 |
Total charge to operations: |  |  |  |
Total charge to operations | $ 5,507,000 | $ 5,433,000 | $ 4,686,000 |
Restricted stock grants |  |  |  |
Summary of the activity of the incentive plans |  |  |  |
Average per share grant price (in dollars per share) | $ 33.75 | $ 20.34 | $ 28.10 |
Deferred compensation to be recognized over vesting period | $ 5,183,000 | $ 3,082,000 | $ 4,202,000 |
Number of non-vested shares: |  |  |  |
Non-vested beginning of period (in shares) | 706,450 | 701,675 | 674,250 |
Number of shares awarded | 153,575 | 151,500 | 149,550 |
Vested during period (in shares) | (146,900) | (145,725) | (122,125) |
Forfeitures (in shares) | (750) | (1,000) |  |
Non-vested end of period (in shares) | 712,375 | 706,450 | 701,675 | 674,250
Total charge to operations: |  |  |  |
Total charge to operations | $ 4,057,000 | $ 3,734,000 | $ 3,529,000 |
Total compensation costs related to non-vested awards that have not yet been recognized | $ 8,239,000 |  |  |
Weighted average vesting period | 2 years 1 month 6 days |  |  |
Restricted stock units |  |  |  |
Summary of the activity of the incentive plans |  |  |  |
Average per share grant price (in dollars per share) | $ 26.44 | $ 30.46 | $ 17.31 |
Deferred compensation to be recognized over vesting period | $ 1,420,000 | $ 1,808,000 | $ 850,000 |
Number of non-vested shares: |  |  |  |
Non-vested beginning of period (in shares) | 230,752 | 223,802 | 225,026 |
Number of shares awarded | 85,350 | 80,700 | 75,026 |
Vested during period (in shares) | (64,488) | (73,750) | (24,343) |
Forfeitures (in shares) | (10,538) |  | (51,907) |
Non-vested end of period (in shares) | 241,076 | 230,752 | 223,802 | 225,026
Total charge to operations: |  |  |  |
Total charge to operations | $ 1,450,000 | $ 1,699,000 | $ 1,157,000 |
Total compensation costs related to non-vested awards that have not yet been recognized | $ 2,301,000 |  |  |
Weighted average vesting period | 1 year 6 months |  |  |
Restricted stock units | Awards granted in 2018 |  |  |  |
Number of non-vested shares: |  |  |  |
Forfeitures (in shares) |  |  |  | (2,500)
Restricted stock units | Awards granted in 2019 |  |  |  |
Number of non-vested shares: |  |  |  |
Forfeitures (in shares) |  |  |  | (2,750)
ROC Awards |  |  |  |
Number of non-vested shares: |  |  |  |
Vested during period (in shares) | 0 |  |  |
Forfeitures (in shares) | 0 |  |  |
Total charge to operations: |  |  |  |
Weighted average vesting period |  | 3 years |  |

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