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PENSION AND OTHER POSTRETIREMENT BENEFITS - Other Postretirement Benefits (Details) - Other Postretirement Benefit Plan - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Service cost $ 4 $ 4 $ 10 $ 12
Interest cost 203 272 611 816
Amortization of actuarial loss 0 174 0 522
Net periodic pension cost/ (income) or postretirement benefit cost $ 207 $ 450 $ 621 $ 1,350