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EMPLOYEE BENEFITS (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of defined benefit plans [abstract]      
Salaries and wages $ 1,604,552 $ 1,549,402 $ 1,631,320
Short-term employee benefits 145,245 132,436 171,366
Termination benefits 85,070 79,062 51,684
Other personnel expenses 188,767 190,233 218,435
Total $ 2,023,634 $ 1,951,133 $ 2,072,805