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OTHER LIABILITIES - Remeasurements of net defined benefit liability (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
OTHER LIABILITIES    
Actuarial losses relating to the defined benefit obligation $ 1,456 $ 215
Net return on assets excluding interest 87 86
Total remeasurements of the net defined benefit liability 1,543 $ 301
Estimate of contributions expected to be paid to plan for next annual reporting period 800  
Benefit payments $ 700