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BENEFIT PLANS (Details) - Pension Benefits - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Plans        
Contribution made to defined benefit pension plan by employer     $ 4,000 $ 4,300
Net periodic benefit cost        
Service cost $ 1,004 $ 1,108 2,177 2,216
Interest cost 1,902 1,890 3,800 3,780
Expected return on plan assets (4,660) (4,020) (9,260) (8,040)
Amortization of unrecognized net loss (gain) 349 (555) 632 (1,110)
Amortization of prior service cost 205 205 410 410
Net periodic benefit $ (1,200) $ (1,372) $ (2,241) $ (2,744)