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POST-EMPLOYMENT BENEFITS (Tables)
12 Months Ended
Dec. 31, 2018
Postemployment Benefits Tables Abstract  
Post-employment benefits
    At December 31   At December 31   At January 1
(in thousands)   2018   2017   2017
             
Accrued benefit obligation $ 2,295 $ 2,365 $ 2,459
  $ 2,295 $ 2,365 $ 2,459
             
Post-employment benefits-by balance sheet presentation:        
Current $ 150 $ 250 $ 250
Non-current   2,145   2,115   2,209
  $ 2,295 $ 2,365 $ 2,459
Post-employment benefits continuity
(in thousands)       2018   2017
             
Balance-January 1     $ 2,365 $ 2,459
Accretion       72   74
Benefits paid       (142)   (168)
Balance-December 31     $ 2,295 $ 2,365