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OTHER FINANCIAL ITEMS, NET (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other financial items, net:      
Mark-to-market adjustment for derivatives $ 15,100 $ 0 $ 0
Impairment of loan 0 (7,627) (15,010)
Financing arrangement fees and other costs (677) (404) (1,841)
Amortization of debt guarantee 1,548 1,563 2,800
Foreign exchange loss on operations (888) (1,909) (2,126)
Other 1,210 (416) (25)
Other financial items, net 20,627 8,691 (112,722)
Interest rate swap      
Other financial items, net:      
Mark-to-market adjustment for derivatives 6,614 2,818 (12,798)
Interest expense on undesignated interest rate swaps (3,802) (10,153) (15,797)
Equity      
Other financial items, net:      
Mark-to-market adjustment for derivatives $ 16,622 $ 24,819 $ (67,925)