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Cash and cash equivalents (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash And Cash Equivalent [Line Items]        
Cash and cash equivalents $ 588,530 $ 556,066 $ 630,438 $ 514,669
Other current financial assets 505,490 312,721    
Other non-current financial hedge assets 8,778 17,131 $ 0  
Other current financial liabilities (298,822) (23,585)    
Other non-current financial liabilities (1,518,926) (1,330,382)    
Total (719,809) 471,755    
Net Debt [Member]        
Cash And Cash Equivalent [Line Items]        
Cash and cash equivalents 588,530 556,066    
Other current financial assets 505,490 312,721    
Other non-current financial hedge assets 3,918 13,425    
Other current financial liabilities (298,822) (23,585)    
Other non-current financial liabilities (1,518,926) (1,330,382)    
Total $ (719,810) $ (471,755)