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PENSIONS - Reconciliation of Fair Value of Plan Assets (Details) - Pensions - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 $ 14,496 $ 14,919
Actual return on plan assets (155) 896
Employer contributions 2,411 2,459
Foreign currency exchange rate changes (500) (638)
Benefit payments (3,058) (3,140)
Fair value of plan assets at December 31 13,194 14,496
Employer contributions and benefit payment amounts paid from employer assets 2,400 2,500
Equity securities    
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 10,032  
Fair value of plan assets at December 31 9,620 10,032
Debt securities    
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 4,004  
Fair value of plan assets at December 31 3,032 4,004
Cash    
Reconciliation of fair value of plan assets:    
Fair value of plan assets at January 1 460  
Fair value of plan assets at December 31 $ 542 $ 460