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RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS - Reclassifications and Adjustments Arising from New Impairment Rules (Details) - IFRS 9 - USD ($) $ in Thousands | Jan. 01, 2018 | Dec. 31, 2017
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Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | $ 507 |
Reserves |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Closing balance as of December 31, 2017 - IAS 39 |  |  | $ 1,416,121
Impact of adopting new accounting standard | [1] | 450 |
Opening balance as of January 1, 2018 - IFRS 9 |  | 1,416,571 |
Retained earnings |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Closing balance as of December 31, 2017 - IAS 39 |  |  | $ 6,491,385
Impact of adopting new accounting standard | [1] | (147) |
Opening balance as of January 1, 2018 - IFRS 9 |  | 6,491,238 |
Financial instruments | Reserves |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | 733 |
Financial instruments | Retained earnings |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | (658) |
Income tax related to Financial instruments | Reserves |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | (124) |
Income tax related to Financial instruments | Retained earnings |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | 124 |
Allowance for impairment of trade receivables | Reserves |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | 0 |
Allowance for impairment of trade receivables | Retained earnings |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | 569 |
Income tax related to Allowance for impairment of trade receivables | Reserves |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | 0 |
Income tax related to Allowance for impairment of trade receivables | Retained earnings |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | (137) |
Effect on Minority interest related to the adoption of IFRS 9 | Reserves |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | (159) |
Effect on Minority interest related to the adoption of IFRS 9 | Retained earnings |  |  |
Disclosure of expected impact of initial application of new standards or interpretations [line items] |  |  |
Impact of adopting new accounting standard |  | $ (45) |
[1] | Shareholders’ equity determined in accordance with accounting principles generally accepted in Luxembourg is disclosed in Note 25 (iii).

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