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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) | 223,802 | 225,026 | 225,026 |  |  |
Non-vested end of period (in shares) |  |  | 223,802 | 225,026 |  |
Restricted stock and RSU grants: |  |  |  |  |  |
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share) | $ 24.68 | $ 25.52 |  |  |  |
Value of stock vested during the year (based on grant price) | $ 2,825,000 | $ 3,004,000 |  |  |  |
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) | $ 23.62 |  |  |  |  |
Restricted stock and RSU grants |  |  |  |  |  |
Total charge to operations: |  |  |  |  |  |
Total charge to operations | $ 1,343,000 | $ 976,000 |  |  |  |
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 |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) | 701,675 | 674,250 | 674,250 |  |  |
Number of shares awarded | 151,500 | 149,550 |  |  |  |
Vested during period (in shares) | (129,925) | (122,125) |  |  |  |
Forfeitures (in shares) | (200) |  |  |  |  |
Non-vested end of period (in shares) | 723,050 | 701,675 | 701,675 | 674,250 |  |
Total charge to operations: |  |  |  |  |  |
Total charge to operations | $ 897,000 | $ 875,000 |  |  |  |
Total compensation costs related to non-vested awards that have not yet been recognized | $ 9,994,000 |  |  |  |  |
Weighted average vesting period | 2 years 9 months 18 days |  |  |  |  |
RSUs |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Number of shares awarded |  |  | 75,026 | 77,776 | 76,250 |
Forfeitures (in shares) |  |  |  | (5,250) |  |
Non-vested end of period (in shares) | 223,802 | 225,026 |  |  |  |
Total charge to operations: |  |  |  |  |  |
Total charge to operations | $ 446,000 | $ 101,000 |  |  |  |
Total compensation costs related to non-vested awards that have not yet been recognized | $ 1,432,000 |  |  |  |  |
Weighted average vesting period | 1 year 3 months 18 days |  |  |  |  |
2019 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 450,952 |  |  |  |  |
2019 Incentive Plan | Restricted stock |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 300,900 |  |  |  |  |
2019 Incentive Plan | RSUs |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 150,052 |  |  |  |  |
2016 Incentive Plan | Restricted stock and RSU grants |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 495,900 |  |  |  |  |
2016 Incentive Plan | Restricted stock |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 422,150 |  |  |  |  |
2016 Incentive Plan | RSUs |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  | 76,250
Vested during period (in shares) |  |  | (24,343) |  |  |
Forfeitures (in shares) |  |  | (51,907) |  |  |
Non-vested end of period (in shares) | 73,750 |  |  |  |  |
Pay-for-performance program | RSUs |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Vested during period (in shares) | 0 |  |  |  |  |
Forfeitures (in shares) | 0 |  |  |  |  |

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