EMPLOYEE BENEFIT PLANS (Details 2) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Employee Benefit Plans
Benefit plan assets	$ 1,198	$ 21,565
Long-term accrued liabilities	$ 977	$ 780

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Name:	us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant