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EMPLOYEE BENEFITS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of defined benefit plans [abstract]  
Schedule of composition of employee benefits

    As of     As of  
    December 31,     December 31,  
    2017     2016  
    ThUS$     ThUS$  
             
Retirements payments     55,119       49,680  
Resignation payments     10,124       10,097  
Other obligations     35,844       22,545  
Total liability for employee benefits     101,087       82,322  
Schedule of movement of employee benefits

The movement in retirements and resignation payments and other obligations:

 

          Increase (decrease)           Actuarial              
    Opening     current service     Benefits     (gains)     Currency     Closing  
    balance     provision     paid     losses     translation     balance  
    ThUS$     ThUS$     ThUS$     ThUS$     ThUS$     ThUS$  
                                     
From January 1 to December 31, 2015     74,102       (13,609 )     (3,824 )     14,631       (6,029 )     65,271  
From January 1 to December 31, 2016     65,271       17,487       (4,536 )     3,105       995       82,322  
From January 1 to December 31, 2017     82,322       21,635       (5,399 )     (2,763 )     5,292       101,087  
Schedule of principal assumptions

The principal assumptions used in the calculation to the provision in Chile are presented below:

 

    As of  
    December 31,  
Assumptions   2017     2016  
             
Discount rate     4.55 %     4.54 %
Expected rate of salary increase     4.50 %     4.50 %
Rate of turnover     6.98 %     6.16 %
Mortality rate     RV-2014       RV-2009  
Inflation rate     2.72 %     2.86 %
Retirement age of women     60       60  
Retirement age of men     65       65  
Schedule of sensitivity analysis actuarial assumptions

The sensitivity analysis for these variables is presented below:

 

    Effect on the liability  
    As of     As of  
    December 31,     December 31,  
    2017     2016  
    ThUS$     ThUS$  
             
Discount rate                
Change in the accrued liability an closing for increase in 100 p.b.     (5,795 )     (5,665 )
Change in the accrued liability an closing for decrease of 100 p.b.     6,617       5,952  
                 
Rate of wage growth                
Change in the accrued liability an closing for increase in 100 p.b.     6,412       6,334  
Change in the accrued liability an closing for decrease of 100 p.b.     (5,750 )     (5,644 )
Schedule of liability for short-term

The liability for short-term:

 

    As of     As of  
    December 31,     December 31,  
    2017     2016  
    ThUS$     ThUS$  
             
Profit-sharing and bonuses (*)     99,862       89,523  

 

  (*) Accounts payables to employees (Note 20 letter b)
Schedule of employment expenses

Employment expenses are detailed below:

 

    For the periods ended  
    December 31,  
    2017     2016     2015  
    ThUS$     ThUS$     ThUS$  
                   
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