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Financial Instruments (Details 34) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Financial liabilities at FVTPL $ 0 $ 24
Derivative financial instruments used for hedging 34,943 59,686
Total derivative financial instruments 34,943 59,710
Gross amounts of liabilities [member]    
Disclosure of financial instruments [Line Items]    
Financial liabilities at FVTPL   24
Derivative financial instruments used for hedging 34,943 59,686
Total derivative financial instruments $ 34,943 $ 59,710