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RETIREMENT BENEFIT PLANS - Schedule of Costs of Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service costs $ 374 $ 348
Interest costs 154 117
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (51) 0
Amortization of prior service costs 0 0
Amortization of actuarial gains (3) (46)
Total 474 419
Postretirement Benefits    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service costs 484 446
Interest costs 409 374
Defined Benefit Plan, Expected Return (Loss) on Plan Assets 0 0
Amortization of prior service costs 40 34
Amortization of actuarial gains 0 0
Total $ 933 $ 854