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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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) | $ 26.47 | $ 24.68 |  |  |  |
Value of stock vested during the year (based on grant price) | $ 3,236,000 | $ 2,825,000 |  |  |  |
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) | $ 33.75 | $ 23.62 |  |  |  |
Total charge to operations: |  |  |  |  |  |
Total charge to operations | $ 1,325,000 | $ 1,343,000 |  |  |  |
Restricted stock grants |  |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |  |
Average per share grant price (in dollars per share) | $ 33.75 | $ 20.34 |  |  |  |
Deferred compensation to be recognized over vesting period | $ 5,183,000 | $ 3,082,000 |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) | 706,450 | 701,675 | 701,675 |  |  |
Number of shares awarded | 153,575 | 151,500 |  |  |  |
Vested during period (in shares) | (130,750) | (129,925) |  |  |  |
Forfeitures (in shares) | (500) | (200) |  |  |  |
Non-vested end of period (in shares) | 728,775 | 723,050 | 706,450 | 701,675 |  |
Total charge to operations: |  |  |  |  |  |
Total charge to operations | $ 957,000 | $ 897,000 |  |  |  |
Weighted average vesting period | 2 years 9 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 | $ 11,346,000 |  |  |  |  |
Restricted stock units |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested beginning of period (in shares) | 230,752 | 223,802 | 223,802 |  |  |
Number of shares awarded |  |  | 80,700 | 75,026 | 77,776 |
Non-vested end of period (in shares) | 230,752 | 223,802 | 230,752 | 223,802 |  |
Total charge to operations: |  |  |  |  |  |
Total charge to operations | $ 368,000 | $ 446,000 |  |  |  |
Weighted average vesting period | 1 year 3 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 | $ 1,963,000 |  |  |  |  |
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) |
2019 Incentive Plan |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 678,027 |  |  |  |  |
2019 Incentive Plan | Restricted stock grants |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 447,275 |  |  |  |  |
2019 Incentive Plan | Restricted stock units |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 230,752 |  |  |  |  |
2016 Incentive Plan | Restricted stock grants |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Non-vested end of period (in shares) | 281,500 |  |  |  |  |
2016 Incentive Plan | Restricted stock units |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Number of shares awarded |  |  |  |  |  | 76,250
Vested during period (in shares) |  |  | (73,750) |  |  |
Pay-for-performance program | Restricted stock units |  |  |  |  |  |
Number of non-vested shares: |  |  |  |  |  |
Vested during period (in shares) | 0 |  |  |  |  |
Forfeitures (in shares) | 0 |  |  |  |  |

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