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PENSIONS - Reconciliation of Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 $ 9,809 $ 15,858
Actual return on plan assets 433 (4,392)
Employer contributions 2,175 2,900
Foreign currency exchange rate changes 474 (1,591)
Benefit payments (2,929) (2,966)
Fair value of plan assets at December 31 $ 9,962 $ 9,809