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PENSIONS - Reconciliation of Fair Value of Plan Assets (Details) - Pensions - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 $ 13,194 $ 14,496
Actual return on plan assets 1,994 (155)
Employer contributions 2,342 2,411
Foreign currency exchange rate changes (1,917) (500)
Benefit payments (3,110) (3,058)
Fair value of plan assets at December 31 12,503 13,194
Employer contributions and benefit payment amounts paid from employer assets 2,300 2,400
Equity securities    
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 9,620  
Fair value of plan assets at December 31 8,936 9,620
Debt securities    
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 3,032  
Fair value of plan assets at December 31 2,860 3,032
Cash    
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 542  
Fair value of plan assets at December 31 $ 707 $ 542