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Other Financial Items - Schedule of Other Financial Items (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Impairment of loan $ 0 $ (7,627)
Financing arrangement fees and other costs (239) (75)
Amortization of debt guarantee 846 0
Others (903) (1,410)
Other financial items, net (7,928) (40,881)
Mark-to-market interest rate swaps valuation    
Derivative Instruments, Gain (Loss) [Line Items]    
Mark-to-market adjustment on derivatives (603) (29,390)
Interest expense on undesignated interest rate swaps (2,706) (5,741)
Equity Derivative    
Derivative Instruments, Gain (Loss) [Line Items]    
Mark-to-market adjustment on derivatives $ (4,323) $ 3,362