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EMPLOYEE BENEFIT PLANS - SERP (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee Benefit Plans
Fair value of plan assets	$ 15,379	$ 9,881
Pension and retirement plans liabilities	17,998	14,440
Settlement loss	(2,363)	(1,180)
SERP
Employee Benefit Plans
Variable life insurance policies investment amount	8,500	7,100
Fair value of plan assets	15,400	9,900
Trading (losses) gains related to the SERP assets	1,500	(2,400)	$ 1,600
Pension and retirement plans liabilities	18,000	14,400
Change in fair value of liability unrealized gains	1,800	(2,300)	1,600
Retirement Income Plan
Employee Benefit Plans
Fair value of plan assets		3,502	$ 6,870
Settlement loss	$ (2,363)	$ (1,180)

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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