RETIREMENT BENEFIT PLANS - Schedule of Costs of Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	$ 373	$ 348	$ 747	$ 696
Interest costs	153	117	307	234
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(50)	0	(101)	0
Amortization of prior service costs	0	0	0	0
Amortization of actuarial gains	(3)	(46)	(6)	(92)
Total	473	419	947	838
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service costs	152	446	636	892
Interest costs	136	374	545	748
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	0	0	0	0
Amortization of prior service costs	(314)	34	(274)	68
Amortization of actuarial gains	(111)	0	(111)	0
Total	$ (137)	$ 854	$ 796	$ 1,708