RETIREMENT BENEFIT PLANS - Schedule of Changes in Expected Benefit Obligation and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Projected Benefit Obligation
Interest costs	$ 1,232	$ 445	$ 0
Pension Benefits
Projected Benefit Obligation
Benefit obligation, beginning of period	9,805	0
Transtar acquisition	0	9,055
Plan amendment	0	0
Service costs	1,763	712
Interest costs	315	108
Actuarial (gains) losses	(2,814)	(20)
Benefit paid	(137)	(50)
Benefit obligation, ending of period	8,932	9,805	0
Plan Assets
Plan assets, beginning balance	0	0
Asset adjustment	1	0
Actual return on plan assets	1	0
Employer contributions	1,846	50
Other benefits paid	(137)	(50)
Plan assets, ending balance	1,711	0	0
Funded status at end of year	(7,221)	(9,805)
Postretirement Benefits
Projected Benefit Obligation
Benefit obligation, beginning of period	30,033	0
Transtar acquisition	(2,854)	28,488
Plan amendment	1,470	0
Service costs	2,143	864
Interest costs	917	337
Actuarial (gains) losses	(3,065)	344
Benefit paid	(121)	0
Benefit obligation, ending of period	28,523	30,033	0
Plan Assets
Plan assets, beginning balance	0	0
Asset adjustment	0	0
Actual return on plan assets	0	0
Employer contributions	0	0
Other benefits paid	0	0
Plan assets, ending balance	0	0	$ 0
Funded status at end of year	$ (28,523)	$ (30,033)