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OTHER LIABILITIES - Components of pension expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined benefit pension plan expense    
Current service cost $ 493 $ 326
Past service cost 8,754  
Administrative expenses 106 119
Interest cost on defined benefit obligation 544 456
Interest on assets (87) (86)
Pension expense $ 9,810 $ 815