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Financial Instruments Risks - Forward Transactions and Foreign Currency Forward (Details)
€ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Foreign Currency Forward Transactions [Abstract]        
Foreign currency forward sales—US$ | $ $ 620,956   $ 760,615  
Foreign currency forward purchases—US$ | $ $ 618,497   $ 620,651  
Foreign currency forward sales—Euros | €   € 1,804   € 5,463
Foreign currency forward purchases—Euros | €   € 35   € 0