EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	2,228	2,706	3,197
Expected return on plan assets	(3,746)	(3,504)	(3,107)
Amortization of losses (gains)	1,154	861	449
Net periodic benefit (credit) cost	(364)	63	539
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	6	6
Interest cost	45	51	54
Expected return on plan assets	0	0	0
Amortization of losses (gains)	20	8	0
Net periodic benefit (credit) cost	$ 73	$ 65	$ 60