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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Dec. 31, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Reversal of impairment loss $ (11,100)        
Property, plant and equipment 12,919,618 $ 12,501,809 $ 12,930,652 $ 10,065,335 $ 10,498,149
cost of restoration   45,600   56,200  
Other financial liabilities $ 1,885,660 1,794,286 1,619,979 3,147,000  
Bottom of range [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Proportion of voting rights held in associate 20.00%        
Top of range [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Proportion of voting rights held in associate 50.00%        
Increase (decrease) due to application of IFRS 15 [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Performance obligations $ 60,800        
Reclassification of performance obligations 16,800        
Adoption Impact of IFRS 16 [Member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Property, plant and equipment [1]   2,548,400   $ 2,865,300 $ 2,931,101,000
Right-of-use assets   36,700 39,400    
Increase (decrease) through appropriation of retained earnings, equity $ 378,700   $ 506,600    
Increase decrease in other reserves   $ 205,900      
Computer software [member] | Bottom of range [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Useful Lives Or Amortisation Rates Intangible Assets Other Than Goodwill 3        
Computer software [member] | Top of range [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Useful Lives Or Amortisation Rates Intangible Assets Other Than Goodwill 10 years        
Contract Costs [Member] | Increase (decrease) due to application of IFRS 15 [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Fee and commission expense $ 22,000        
Travel expense 15,600        
Reclassification of commissions expenses 16,800        
Contract Liabilities [Member] | Increase (decrease) due to application of IFRS 15 [member]          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Narrative [Line Items]          
Ground transportation service 15,600        
Traveler's checks $ 6,600        
[1] Company recognized under Property, plant and equipment right of use assets for US $ 2,865.3 million as of January 1, 2018 and US $ 2,548.4 as of December 31, 2018, associated with contracts that meet the definition of lease (Note 2.21 & 17).