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BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES - Changes in Presentation of Derivative Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
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.