EMPLOYEE BENEFIT PLANS - Postretirement Benefits Other than Pensions - Actuarial Gains and Losses (Details) - Postretirement Medical Benefit Plans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax [Roll Forward]
Amounts included in accumulated other comprehensive income at beginning of period	$ 1,114
Amortization of prior service credit into other income	(409)	$ (409)
Amounts included in accumulated other comprehensive income at end of period	$ 705