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PENSIONS - Reconciliation of Fair Value of Plan Assets (Details) - Pensions - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 $ 13,634 $ 12,503
Actual (loss)/ return on plan assets (249) 1,039
Employer contributions 3,617 2,316
Foreign currency exchange rate changes (730) 1,076
Benefit payments (3,151) (3,300)
Fair value of plan assets at December 31 13,121 13,634
Employer contributions and benefit payment amounts paid from employer assets $ 3,600 $ 2,300