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EMPLOYEE BENEFIT PLANS - Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (losses) gains | $ (1,587) | $ (1,514) | $ (1,743)
Amortization of losses (gains) | 861 | 449 | 673
Postretirement |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net (losses) gains | (207) | (285) | 149
Amortization of losses (gains) | $ 8 | $ 0 | $ 2

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