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EMPLOYEE BENEFIT PLANS - Investments Held in Rabbi Trusts (Details) - Rabbi Trusts - Level 1 - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | $ 82,297 | $ 70,953
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | 24,573 | 18,460
Fixed income mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | 10,269 | 9,800
United States | Equity mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | 39,066 | 34,035
Foreign | Equity mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total Investments held in Rabbi Trusts | $ 8,389 | $ 8,658

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