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RETIREMENT AND DEFERRED COMPENSATION PLANS - Defined Benefit Plans Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
United States |  |
Changes in the benefit obligations and plan assets |  |
Employer contribution | $ 448,000 | $ 436,000
Defined Benefit Plan Minimum Funding Requirement By Employer | 0 |
Expected contribution in next fiscal year | 500,000 |
United States | Supplemental Employee Retirement Plan |  |
Changes in the benefit obligations and plan assets |  |
Liability, defined benefit plan | 16,800,000 | 12,600,000
Foreign Plans |  |
Changes in the benefit obligations and plan assets |  |
Employer contribution | 7,527,000 | $ 6,542,000
Expected contribution in next fiscal year | $ 500,000 |

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