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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2010
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) |  | $ 24.96 | $ 23.83 | $ 22.89 |
Value of stock vested during the year (based on grant price) |  | $ 2,365,000 | $ 2,289,000 | $ 3,008,000 |
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share) |  | $ 25.40 | $ 23.59 | $ 8.37 |
Total charge to operations: |  |  |  |  |
Share based compensation charged to operations |  | $ 3,870,000 | $ 3,510,000 | $ 3,133,000 |
Restricted stock |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Average per share grant price (in dollars per share) |  | $ 25.70 | $ 25.31 | $ 24.75 |
Deferred compensation to be recognized over vesting period |  | $ 3,856,000 | $ 3,664,000 | $ 3,467,000 |
Number of non-vested shares: |  |  |  |  |
Non-vested beginning of period (in shares) |  | 651,250 | 612,900 | 591,750 |
Number of shares awarded |  | 150,050 | 144,750 | 140,100 |
Vested during year (in shares) |  | (114,650) | (106,000) | (118,450) |
Forfeitures (in shares) |  | (12,400) | (400) | (500) |
Non-vested end of period (in shares) |  | 674,250 | 651,250 | 612,900 |
Total charge to operations: |  |  |  |  |
Share based compensation charged to operations |  | $ 3,229,000 | $ 3,028,000 | $ 2,966,000 |
Total compensation costs related to non-vested awards that have not yet been recognized |  | $ 7,140,000 |  |  |
Weighted average remaining vesting period |  | 2 years 1 month 6 days |  |  |
RSUs |  |  |  |  |
Summary of the activity of the incentive plans |  |  |  |  |
Average per share grant price (in dollars per share) |  | $ 28.96 | $ 26.41 | $ 24.03 |
Deferred compensation to be recognized over vesting period |  | $ 865,000 | $ 952,000 | $ 1,004,000 |
Number of non-vested shares: |  |  |  |  |
Non-vested beginning of period (in shares) |  | 152,500 | 76,250 | 200,000 |
Number of shares awarded |  | 77,776 | 76,250 | 76,250 |
Vested during year (in shares) |  |  |  | (113,584) |
Forfeitures (in shares) |  | (5,250) |  | (86,416) |
Non-vested end of period (in shares) |  | 225,026 | 152,500 | 76,250 |
Total charge to operations: |  |  |  |  |
Share based compensation charged to operations |  | $ 641,000 | $ 482,000 | $ 167,000 |
Total compensation costs related to non-vested awards that have not yet been recognized |  | $ 1,277,000 |  |  |
Weighted average remaining vesting period |  | 1 year 6 months |  |  |
2016 and 2012 Incentive Plans | Restricted stock and RSU grants |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Non-vested end of period (in shares) |  | 824,250 |  |  |
2016 and 2012 Incentive Plans | Restricted stock |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Non-vested end of period (in shares) |  | 674,250 |  |  |
2016 and 2012 Incentive Plans | RSUs |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Non-vested end of period (in shares) |  | 150,000 |  |  |
2019 Incentive Plan | RSUs |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Number of shares awarded |  | 75,026 |  |  |
2009 Incentive Plan | RSUs |  |  |  |  |
Number of non-vested shares: |  |  |  |  |
Number of shares awarded |  |  |  |  | 200,000
Vested during year (in shares) | (113,584) |  |  | (113,584) |
Forfeitures (in shares) |  |  |  | (86,416) |

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