Financial Instruments - Financial Liabilities (Details) - Fair value - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trade payables	$ 280,626	$ 390,277
Other taxes	44,085	50,099
Employee-related payables	61,963	74,781
Other current liabilities	38,982	35,886
Financial liabilities	159,425	4,405
Total	$ 585,081	$ 555,448