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PENSION AND OTHER POSTRETIREMENT BENEFITS - Pension Benefits - Net Periodic Pension Cost/(Income) (Details) - Pension 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 $ 1,661 $ 1,541 $ 4,983 $ 4,623
Interest cost 15,293 15,582 45,880 46,747
Expected return on plan assets (15,282) (18,109) (45,846) (54,327)
Amortization of actuarial loss 4,892 3,600 14,675 10,800
Amortization of prior service credit (486) (486) (1,458) (1,459)
Effect of settlement     0 (27)
Net periodic pension cost/ (income) or postretirement benefit cost 6,078 2,128 18,234 6,357
Qualified Plans        
Pension Benefits        
Service cost 1,661 1,541 4,983 4,623
Interest cost 13,217 13,376 39,651 40,128
Expected return on plan assets (15,282) (18,109) (45,846) (54,327)
Amortization of actuarial loss 4,026 2,603 12,078 7,809
Amortization of prior service credit (486) (486) (1,458) (1,459)
Effect of settlement     0 0
Net periodic pension cost/ (income) or postretirement benefit cost 3,136 (1,075) 9,408 (3,226)
Non- Qualified Plans        
Pension Benefits        
Service cost 0 0 0 0
Interest cost 2,076 2,206 6,229 6,619
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 866 997 2,597 2,991
Amortization of prior service credit 0 0 0 0
Effect of settlement     0 (27)
Net periodic pension cost/ (income) or postretirement benefit cost $ 2,942 $ 3,203 $ 8,826 $ 9,583