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Financial Instruments - Financial Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Trade payables $ 332,388 $ 417,032
Other taxes 45,233 58,783
Employee-related payables 53,709 66,219
Other current liabilities 59,463 65,677
Financial liabilities 5,264 3,657
Total $ 496,057 $ 611,368