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Financial Instruments - Financial Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trade payables $ 350,690 $ 365,788
Other taxes 42,713 44,831
Employee-related payables 59,661 55,874
Other current liabilities 26,802 30,221
Financial liabilities 10,468 85,580
Total 490,334 582,294
Fair value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trade payables 350,690 365,788
Other taxes 42,713 44,831
Employee-related payables 59,661 55,874
Other current liabilities 26,802 30,221
Financial liabilities 10,468 85,580
Total $ 490,334 $ 582,294