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PENSIONS - Reconciliation of Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 $ 13,121 $ 13,634
Actual return/(loss) on plan assets 1,216 (249)
Employer contributions 3,411 3,617
Foreign currency exchange rate changes 541 (730)
Benefit payments (3,066) (3,151)
Fair value of plan assets at December 31 $ 15,223 $ 13,121