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PENSIONS AND OTHER BENEFITS - Components of net periodic cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Service cost   
Interest cost on benefit obligation 67us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (75)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of net gain (4)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic benefit cost $ (12)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost