EMPLOYEE BENEFIT PLANS - Recognized in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amounts recognized in the consolidated balance sheets
Pension and postretirement liabilities, less current portion	$ (16,733)	$ (18,555)
Supplemental Benefit Plan
Amounts recognized in the consolidated balance sheets
Pension and postretirement liabilities, less current portion	(381)	(392)
Liabilities recognized	(381)	(392)
Postretirement Health Benefit Plan
Amounts recognized in the consolidated balance sheets
Current portion of pension and postretirement liabilities	(640)	(588)
Pension and postretirement liabilities, less current portion	(16,352)	(18,163)
Liabilities recognized	$ (16,992)	$ (18,751)