v3.26.1
PENSION BENEFITS - Schedule of Components of Net Periodic Pension Cost (Details) - Pension Plan - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Benefits    
Service cost $ 1,977 $ 1,661
Interest cost 13,787 15,294
Expected return on plan assets (15,358) (15,282)
Amortization of actuarial loss 5,461 4,891
Amortization of prior service credit (486) (486)
Net periodic pension cost 5,381 6,078
Qualified Plans    
Pension Benefits    
Service cost 1,977 1,661
Interest cost 11,930 13,217
Expected return on plan assets (15,358) (15,282)
Amortization of actuarial loss 4,483 4,026
Amortization of prior service credit (486) (486)
Net periodic pension cost 2,546 3,136
Non- Qualified Plans    
Pension Benefits    
Service cost 0 0
Interest cost 1,857 2,077
Expected return on plan assets 0 0
Amortization of actuarial loss 978 865
Amortization of prior service credit 0 0
Net periodic pension cost $ 2,835 $ 2,942