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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).

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