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Financial Instruments - Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Derivative Liabilities:    
Included in financial liabilities - current portion $ 573 $ 0
Fair Value, Inputs, Level 2 | Fair value    
Derivative Assets:    
Included in other current assets 0 5,159
Derivative Liabilities:    
Included in financial liabilities - current portion $ 573 $ 0