EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Net Periodic Pension Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net periodic pension benefit cost
Service cost	$ 1,282	$ 1,068	$ 272
Interest cost	1,452	1,716	1,211
Expected return on plan assets	(642)	(683)	(615)
Amortization of actuarial gains and losses	820	459	411
Net periodic pension cost	$ 2,912	$ 2,560	$ 1,279