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Financial Risk Management - Financial Assets and Liabilities Which Impact Profit and Loss (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Currency exposure / functional currency $ 3,600,000 $ 5,300,000
Argentine Peso / U.S. dollar foreign exchange risk [member]    
Statement Line Items [Line Items]    
Currency exposure / functional currency (186,867,000) (64,482,000)
Euro / U.S. dollar foreign exchange risk [member]    
Statement Line Items [Line Items]    
Currency exposure / functional currency $ (175,419,000) $ (365,926,000)