BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension Benefits
Pension Plans
Contribution made to defined benefit pension plan by employer		$ 100
Net periodic benefit cost
Service cost	$ 1,108	1,240
Interest cost	1,890	1,334
Expected return on plan assets	(4,020)	(4,756)
Amortization of unrecognized net (gain) loss	(555)	211
Amortization of prior service cost	205	154
Net periodic benefit	(1,372)	(1,817)
Post-retirement Benefits
Net periodic benefit cost
Service cost	0	0
Interest cost	23	11
Expected return on plan assets	0	0
Amortization of unrecognized net (gain) loss	6	9
Amortization of prior service cost	(45)	(45)
Net periodic benefit	$ (16)	$ (25)