PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)

12 Months Ended

Dec. 31, 2025

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS [Abstract]

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets

Information with respect to the Plan for which INSW uses a December 31 measurement date, is as follows:

(Dollars in thousands)	December 31, 2025		December 31, 2024
Change in benefit obligation:
Benefit obligation at beginning of year	$	18,720	$	17,876
Interest cost on benefit obligation		812		797
Actuarial losses		598		1,233
Benefits paid		(1,356)		(890)
Foreign exchange losses/(gains)		1,365		(296)
Benefit obligation at year end		20,139		18,720
Change in plan assets:
Fair value of plan assets at beginning of year		18,679		17,703
Actual return on plan assets		1,367		(1,373)
Employer contributions		—		3,649
Benefits paid		(1,356)		(890)
Foreign exchange gains/(losses)		1,361		(410)
Fair value of plan assets at year end		20,051		18,679
Unfunded status at December 31	$	(88)	$	(41)

Schedule of Net Benefit Costs

(Dollars in thousands)		2025		2024		2023
Components of expense:
Interest cost on benefit obligation	$	812	$	797	$	827
Expected return on plan assets		(811)		(914)		(1,080)
Amortization of prior-service costs		78		76		74
Recognized net actuarial loss		955		664		506
Net periodic benefit cost	$	1,034	$	623	$	327

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

The weighted-average assumptions used to determine benefit obligations follow:

	December 31, 2025		December 31, 2024
Discount rate		4.45%		4.27%

Schedule of Assumptions Used

The weighted-average assumptions used to determine net periodic benefit costs follow:

	2025	2024	2023
Discount rate	4.27%	4.55%	4.90%
Expected (long-term) return on plan assets	4.27%	4.90%	6.37%
Rate of future compensation increases	-	-	-

Schedule of Expected Benefit Payments

Expected benefit payments are as follows:

(Dollars in thousands)	Pension benefits
2026	$	1,166
2027		1,211
2028		1,242
2029		1,293
2030		1,332
Years 2031-2035		6,871
	$	13,115

Schedule of Changes in Fair Value of Plan Assets

The fair values of the Company’s pension plan assets at December 31, 2025, by asset category are as follows:

(Dollars in thousands)	Fair Value		Level 1		Level 3 (1)
Cash and cash equivalents	$	68	$	68	$	—
Insured assets		19,983		—		19,983
Total	$	20,051	$	68	$	19,983

(1) The insured assets as of December 31, 2025 were measured using assumptions consistent with those used to measure the Plan liability as of December 31, 2025.