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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Restricted stock and RSU grants |  |  |  |  |  |  |
Restricted stock and RSU grants: |  |  |  |  |  |  |
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) | $ 24.53 | $ 25.65 | $ 24.53 | $ 25.65 |  |  |
Value of stock vested during the year (based on grant price) | $ 2,340,000 | $ 585,000 | $ 5,165,000 | $ 3,589,000 |  |  |
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) | $ 24.86 | $ 24.03 | $ 24.24 | $ 24.03 |  |  |
Total charge to operations: |  |  |  |  |  |  |
Total charge to operations | $ 1,685,000 | $ 1,329,000 | $ 3,028,000 | $ 2,305,000 |  |  |
Restricted stock |  |  |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |  |  |
Average per share grant price (in dollars per share) |  |  | $ 20.34 | $ 28.10 |  |  |
Deferred compensation to be recognized over vesting period | $ 3,082,000 | $ 4,202,000 | $ 3,082,000 | $ 4,202,000 |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Non-vested beginning of period (in shares) | 723,050 | 701,675 | 701,675 | 674,250 |  | 674,250 |
Number of shares awarded |  |  | 151,500 | 149,550 |  |  |
Vested during period (in shares) | (15,800) |  | (145,725) | (122,125) |  |  |
Forfeitures (in shares) | (200) |  | (400) |  |  |  |
Non-vested end of period (in shares) | 707,050 | 701,675 | 707,050 | 701,675 |  | 701,675 | 674,250
Total charge to operations: |  |  |  |  |  |  |
Total charge to operations | $ 1,092,000 | $ 884,000 | $ 1,989,000 | $ 1,759,000 |  |  |
Total compensation costs related to non-vested awards that have not yet been recognized | $ 8,897,000 |  | $ 8,897,000 |  |  |  |
Weighted average vesting period |  |  | 2 years 7 months 6 days |  |  |  |
RSUs |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Non-vested beginning of period (in shares) | 223,802 | 225,026 | 223,802 | 225,026 |  | 225,026 |
Vested during period (in shares) | (73,750) | (24,343) | (73,750) | (24,343) |  |  |
Forfeitures (in shares) |  | (51,907) |  | (51,907) |  |  | (2,750)
Non-vested end of period (in shares) | 150,052 | 148,776 | 150,052 | 148,776 |  | 223,802 | 225,026
Total charge to operations: |  |  |  |  |  |  |
Total charge to operations | $ 593,000 | $ 445,000 | $ 1,039,000 | $ 546,000 |  |  |
Total compensation costs related to non-vested awards that have not yet been recognized | $ 1,145,000 |  | $ 1,145,000 |  |  |  |
Weighted average vesting period |  |  | 1 year 6 months |  |  |  |
2019 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Non-vested end of period (in shares) | 444,452 |  | 444,452 |  |  |  |
2019 Incentive Plan | Restricted stock |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Non-vested end of period (in shares) | 294,400 |  | 294,400 |  |  |  |
2019 Incentive Plan | RSUs |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Non-vested end of period (in shares) | 150,052 |  | 150,052 |  |  |  |
2016 Incentive Plan | Restricted stock |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Non-vested end of period (in shares) | 412,650 |  | 412,650 |  |  |  |
2016 Incentive Plan | RSUs |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Vested during period (in shares) |  |  | (73,750) | (24,343) |  |  |
Forfeitures (in shares) |  |  |  | (51,907) | (2,500) |  |
Non-vested end of period (in shares) | 76,250 |  | 76,250 |  |  |  |
Pay-for-performance program | RSUs |  |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |  |
Vested during period (in shares) | 0 |  | 0 |  |  |  |
Forfeitures (in shares) | 0 |  | 0 |  |  |  |

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