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PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS - SCHEDULE OF COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits       
Amounts recognized in net periodic benefit cost      
Service cost $ 15,323 $ 14,991 $ 17,500
Interest cost 38,675 41,205 30,491
Expected return on plan assets (51,193) (48,978) (47,637)
Amortization of prior service credit (5,493) (5,658) (5,651)
Amortization of net (gain) loss 15,248 19,846 16,060
Curtailment credit 0 0 0
Settlement loss 14,894 15,254 20,692
Total net periodic benefit cost 27,454 36,660 31,455
Change in plan assets and benefit obligations recognized in AOCI, pre-tax      
Actuarial net (gain) loss (15,513) (32,720) 22,609
Prior service cost (credit) 5,436 5,670 5,601
Total recognized in other comprehensive (income) loss, pre-tax (10,077) (27,050) 28,210
Net amounts recognized in periodic benefit cost and AOCI 17,377 9,610 59,665
Other Benefits       
Amounts recognized in net periodic benefit cost      
Service cost 131 221 302
Interest cost 4,852 7,171 4,603
Expected return on plan assets 0 0 0
Amortization of prior service credit (151) (50) 0
Amortization of net (gain) loss 557 (966) (92)
Curtailment credit 0 (740) 0
Settlement loss 0 926 0
Total net periodic benefit cost 5,389 6,562 4,813
Change in plan assets and benefit obligations recognized in AOCI, pre-tax      
Actuarial net (gain) loss 4,609 38,698 (26,212)
Prior service cost (credit) (963) (736) 0
Total recognized in other comprehensive (income) loss, pre-tax 3,646 37,962 (26,212)
Net amounts recognized in periodic benefit cost and AOCI $ 9,035 $ 44,524 $ (21,399)