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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits       
Amounts recognized in net periodic benefit cost      
Service cost $ 17,500 $ 21,361 $ 21,734
Interest cost 30,491 18,320 26,112
Expected return on plan assets (47,637) (49,091) (52,907)
Amortization of prior service (credit) cost (5,651) (6,142) (7,308)
Amortization of net loss 16,060 20,556 26,952
Settlement loss 20,692 16,085 13,421
Total net periodic benefit cost 31,455 21,089 28,004
Change in plan assets and benefit obligations recognized in AOCI, pre-tax      
Actuarial net (gain) loss 22,609 (80,047) (15,606)
Prior service cost (credit) 5,601 6,447 7,310
Total recognized in other comprehensive (income) loss, pre-tax 28,210 (73,600) (8,296)
Net amounts recognized in periodic benefit cost and AOCI 59,665 (52,511) 19,708
Other Benefits       
Amounts recognized in net periodic benefit cost      
Service cost 302 1,879 159
Interest cost 4,603 3,857 6,029
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 0 0 300
Amortization of net loss (92) 1,593 (39)
Settlement loss 0 0 0
Total net periodic benefit cost 4,813 7,329 6,449
Change in plan assets and benefit obligations recognized in AOCI, pre-tax      
Actuarial net (gain) loss (26,212) (16,374) 15,266
Prior service cost (credit) 0 0 (300)
Total recognized in other comprehensive (income) loss, pre-tax (26,212) (16,374) 14,966
Net amounts recognized in periodic benefit cost and AOCI $ (21,399) $ (9,045) $ 21,415