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Consolidated statements of other comprehensive income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of comprehensive income [Line Items]      
Net profit (loss) $ (11,654) $ 64,435 $ (327,814)
Other comprehensive income (loss) to be reclassified to profit or loss in subsequent periods      
Net change in unrealized gain (loss) on cash flow hedges 31,464 (26,822) (4,368)
Income tax effect (9,916) 7,963 (1,301)
Unrealized gain on investments 1,053 (427) 279
Other comprehensive profit (loss) 22,601 (19,286) (5,390)
Total other comprehensive profit (loss), net of income tax 10,947 45,149 (333,204)
Attributable to:      
Equity holders of the parent (260) 48,718 (327,515)
Non-controlling interests 11,207 (3,569) (5,689)
Total other comprehensive loss $ 10,947 $ 45,149 $ (333,204)