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PENSIONS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of net periodic benefit cost:      
Service cost $ (33) $ (75) $ (120)
Interest cost (1,622) (1,087) (879)
Expected return on plan assets 427 254 214
Recognized actuarial loss (307) (774) (1,131)
Net periodic benefit cost $ (1,535) $ (1,682) $ (1,916)