EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Amortization of:
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Compensation and benefits	Compensation and benefits	Compensation and benefits	Compensation and benefits
Pension Plans
Components of Net Periodic Benefit Cost (Credit):
Service cost	$ 84	$ 59	$ 182	$ 270
Interest cost	5,272	2,817	10,424	5,817
Expected return on plan assets	(6,032)	(6,195)	(11,848)	(12,819)
Amortization of:
Prior service cost	27	26	53	55
Net actuarial loss	1,534	1,027	3,044	2,114
Settlement loss	783	407	1,542	843
Net periodic benefit cost (credit)	$ 1,668	$ (1,859)	$ 3,397	$ (3,720)