Financial Instruments - Financial Liabilities (Details) - Fair value - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trade payables	$ 300,315	$ 390,277
Other taxes	49,159	50,099
Employee-related payables	73,251	74,781
Other current liabilities	35,709	35,886
Financial liabilities	2,858	4,405
Total	$ 461,292	$ 555,448