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BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES - Changes in Presentation of Derivative Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in fair value of derivative instruments |  | $ 38,610 | $ (24,498) | $ (26,644)
Other current and non-current assets |  | (13,532) | (80,897) | 14,615
Other current and non-current liabilities | [1] | 40,164 | 99,886 | 9,680
(Losses) gains on derivative instruments |  | (30,541) | 20,696 | 16,491
Other financial items, net |  | (1,481) | (69) | (7,800)
Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in fair value of derivative instruments |  |  | 0 | 0
Other current and non-current assets |  |  | (102,453) | 14,924
Other current and non-current liabilities |  |  | 81,844 | (17,273)
(Losses) gains on derivative instruments |  |  | 0 | 0
Other financial items, net |  |  | 20,627 | 8,691
Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in fair value of derivative instruments |  |  | (24,498) | (26,644)
Other current and non-current assets |  |  | 21,556 | (309)
Other current and non-current liabilities |  |  | 18,042 | 26,953
(Losses) gains on derivative instruments |  |  | 20,696 | 16,491
Other financial items, net |  |  | (20,696) | (16,491)
Energy Related Derivative |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in fair value of derivative instruments |  | $ 9,970 | (15,100) | $ 0
Energy Related Derivative | Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in fair value of derivative instruments |  |  | 0 |
Energy Related Derivative | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Change in fair value of derivative instruments |  |  | $ (15,100) |
[1] | Includes accretion of discount on convertible bonds of $13.5 million, $11.8 million and $5.7 million for the years ended December 31, 2018, 2017 and 2016, respectively.

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- Definition Amount of unrealized gain (loss) recognized in the income statement for a financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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