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EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 12,040 | $ 11,078 | $ 9,990
Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 12,040 | 11,069 |
Recurring | Large-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2,364 | 2,144 |
Recurring | Mid-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 744 | 590 |
Recurring | Small-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 765 | 557 |
Recurring | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,499 | 1,009 |
Recurring | Fixed-income - core plus |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3,880 | 4,028 |
Recurring | Intermediate duration |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,338 | 1,371 |
Recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 510 | 574 |
Recurring | Common/collective trusts - large-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 620 | 566 |
Recurring | Cash equivalents - money market |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 320 | 230 |
Level 1 | Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 11,420 | 10,503 |
Level 1 | Recurring | Large-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 2,364 | 2,144 |
Level 1 | Recurring | Mid-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 744 | 590 |
Level 1 | Recurring | Small-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 765 | 557 |
Level 1 | Recurring | International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,499 | 1,009 |
Level 1 | Recurring | Fixed-income - core plus |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 3,880 | 4,028 |
Level 1 | Recurring | Intermediate duration |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 1,338 | 1,371 |
Level 1 | Recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 510 | 574 |
Level 1 | Recurring | Cash equivalents - money market |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 320 | 230 |
Level 2 | Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | 620 | 566 |
Level 2 | Recurring | Common/collective trusts - large-cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets | $ 620 | $ 566 |

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