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EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) plan shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cost recognized | $ 1,733 | $ 1,603 | $ 1,488 |
Common Stock, authorized (in shares) | shares | 40,000,000 | 40,000,000 |  |
Treasury Stock (in shares) | shares | 1,200,103 | 1,087,840 |  |
Number of active plans | plan | 2 |  |  |
Share-based compensation expense | $ 2,723 | $ 2,424 | $ 2,612 |
Grants in period (in shares) | shares | 109,220 |  |  |
Stock shares repurchased (in shares) | shares | 10,437 | 77,481 | 27,214 |
Stock shares repurchased | $ 358 | $ 5,489 | $ 2,324 |
EDC plan investments | 2,007 | 1,185 |  |
EDC plan liabilities | $ 3,140 | $ 1,337 |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants in period (in shares) | shares | 38,700 | 45,993 | 42,136 |
Number of nonvested shares (in shares) | shares | 118,855 | 116,855 | 329,205 | 368,492
RSUs vested in period (in shares) | shares | 31,422 | 235,409 | 80,343 |
Options, vested in period, fair value | $ 1,384 | $ 2,951 | $ 1,239 |
Unrecognized compensation costs, other than options | $ 1,570 |  |  |
Period for recognition of unrecognized compensation cost | 1 year 7 months 6 days |  |  |
Short-term Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Targeted bonus award expense | $ 9,732 | 461 | 5,581 |
Short-term Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 2,566 | 123 | $ 821 |
Award vesting period | 48 months |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Award vesting period, tranche one |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 12 months |  |  |
Short-term Incentive Plan | Restricted Stock Units (RSUs) | Remaining award vesting period |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 36 months |  |  |
The 2014 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock authorized but not granted (in shares) | shares | 1,500,000 |  |  |
The 2014 Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Grants in period (in shares) | shares | 421,748 |  |  |
The Director's Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock authorized but not granted (in shares) | shares | 300,000 |  |  |
Post-employment benefits |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Liability, defined benefit plan, current | $ 266 | 441 |  |
Liability, defined benefit plan, noncurrent | $ 1,476 | $ 2,509 |  |

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