BENEFIT PLANS (Details) - Pension Benefits - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Plans
Contribution made to defined benefit pension plan by employer		$ 4,300		$ 100
Net periodic benefit cost
Service cost	$ 1,108		$ 1,240		$ 3,324	$ 3,720
Interest cost	1,890		1,334		5,670	4,002
Expected return on plan assets	(4,020)		(4,756)		(12,060)	(14,268)
Amortization of unrecognized net (gain) loss	(555)		211		(1,665)	633
Amortization of prior service cost	205		154		615	462
Net periodic benefit	$ (1,372)		$ (1,817)		$ (4,116)	$ (5,451)