v3.26.3
PENSION BENEFITS - Schedule of Components of Net Periodic Pension Cost (Details) - Pension Plan - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Benefits        
Service cost $ 1,977 $ 1,661 $ 5,932 $ 4,983
Interest cost 13,787 15,293 41,361 45,880
Expected return on plan assets (15,302) (15,282) (45,962) (45,846)
Amortization of actuarial loss 5,461 4,892 16,382 14,675
Amortization of prior service credit (486) (486) (1,459) (1,458)
Net periodic pension cost 5,437 6,078 16,254 18,234
Qualified Plans        
Pension Benefits        
Service cost 1,977 1,661 5,932 4,983
Interest cost 11,930 13,217 35,790 39,651
Expected return on plan assets (15,302) (15,282) (45,962) (45,846)
Amortization of actuarial loss 4,483 4,026 13,448 12,078
Amortization of prior service credit (486) (486) (1,459) (1,458)
Net periodic pension cost 2,602 3,136 7,749 9,408
Non- Qualified Plans        
Pension Benefits        
Service cost 0 0 0 0
Interest cost 1,857 2,076 5,571 6,229
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 978 866 2,934 2,597
Amortization of prior service credit 0 0 0 0
Net periodic pension cost $ 2,835 $ 2,942 $ 8,505 $ 8,826