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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Liabilities in Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan [Member] |  |
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS |  |
Accrued interest and other liabilities | $ 39 | $ 5
Other Postretirement Benefits Plan [Member] |  |
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS |  |
Accrued interest and other liabilities | $ 1,347 | $ 1,326

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