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EMPLOYEE BENEFITS (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of defined benefit plans [abstract]      
Opening balance $ 82,322 $ 65,271 $ 74,102
Increase (decrease) current service provision 21,635 17,487 (13,609)
Benefits paid (5,399) (4,536) (3,824)
Actuarial (gains) losses (2,763) 3,105 14,631
Currency translation 5,292 995 (6,029)
Closing balance $ 101,087 $ 82,322 $ 65,271