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POSTRETIREMENT BENEFITS (obligations and funded status) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in benefit obligation |  |  |  |
Interest cost |  | $ 1,985 | $ 1,121 | $ 968
Change in plan assets |  |  |  |
Fair value of plan assets, beginning of year |  | 119,052 |  |
Fair value of plan assets, end of year |  | 130,914 | 119,052 |
Amounts recognized on the consolidated balance sheets |  |  |  |
Other non-current assets |  | 94,939 | 79,343 |
Amounts recognized in accumulated other comprehensive loss |  |  |  |
Unrecognized net actuarial loss |  | (29,019) | (39,871) |
Unrecognized prior service credit |  | 7,071 | 8,493 |
Tax effect |  | 2,124 | 4,506 |
Amount recognized in accumulated other comprehensive loss, net of tax |  | (19,824) | (26,872) |
Postretirement benefit plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation, beginning of year |  | 39,709 | 57,781 |
Interest cost |  | 1,874 | 1,069 |
Net actuarial (gain) loss |  | (785) | (13,839) |
Benefits paid from plan assets and company funds |  | (4,823) | (5,302) |
Benefit obligation, end of year |  | 35,975 | 39,709 | 57,781
Change in plan assets |  |  |  |
Fair value of plan assets, beginning of year |  | 119,052 | 144,800 |
Return (loss) on plan assets |  | 15,241 | (22,116) |
Benefits paid |  | (3,379) | (3,632) |
Fair value of plan assets, end of year |  | 130,914 | 119,052 | 144,800
Funded status |  | 94,939 | 79,343 |
Amounts recognized on the consolidated balance sheets |  |  |  |
Other non-current assets |  | $ 94,939 | 79,343 |
Amounts recognized in accumulated other comprehensive loss |  |  |  |
Amortization period net actuarial loss |  | 12 years |  |
Pension plan [Member] |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligation, beginning of year | [1] | $ 2,374 | 3,060 |
Interest cost |  | 111 | 52 |
Net actuarial (gain) loss |  | 128 | (414) |
Benefits paid from plan assets and company funds |  | (324) | (324) |
Benefit obligation, end of year | [1] | 2,289 | 2,374 | 3,060
Change in plan assets |  |  |  |
Fair value of plan assets, beginning of year |  | 0 | 0 |
Fair value of plan assets, end of year |  | 0 | 0 | $ 0
Funded status |  | (2,289) | (2,374) |
Amounts recognized on the consolidated balance sheets |  |  |  |
Accrued liabilities |  | 324 | 324 |
Other non-current liabilities |  | $ 1,965 | $ 2,050 |
[1] | The accumulated benefit obligation equals the projected benefit obligation

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