EMPLOYEE BENEFIT PLANS - Schedule of Net Pension Cost (Credit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 77
Interest cost	1,764	2,323	2,303
Settlement cost	257	221	0
Expected return on plan assets	(2,309)	(2,378)	(3,720)
Amortization of prior service cost	32	32	0
Amortization of net actuarial (gain) loss	0	0	(78)
Net pension cost (credit)	$ (256)	$ 198	$ (1,418)