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Other Financial Items - Schedule of Other Financial Items (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Impairment of loan $ 0 $ (7,627)
Financing arrangement fees and other costs (283) 130
Amortization of debt guarantee 1,234 0
Others 1,775 (502)
Other financial items, net (3,495) (14,979)
Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Mark-to-market adjustment for derivatives 1,056 (18,699)
Interest expense on undesignated interest rate swaps (3,436) (8,165)
Equity Derivatives    
Derivative Instruments, Gain (Loss) [Line Items]    
Mark-to-market adjustment for derivatives $ (3,841) $ 19,884