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PENSIONS AND OTHER BENEFITS - Components of net periodic cost (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Service cost
Interest cost on benefit obligation 277
Expected return on plan assets (297)
Amortization of net gain (1)
Net periodic benefit cost (21)
Additional amount recognized due to settlement or curtailment
Total recognized in net periodic cost (21)
Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income):  
Net actuarial loss 923
Amortization of net gain 1
Total recognized in other comprehensive loss (income) 924
Total recognized in net periodic benefit and other comprehensive loss $ 903