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Financial Instruments - Financial Assets and Credit Risk (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Concentration Risk [Line Items]    
Maximum exposure $ 569,751 $ 625,365
Trade receivables, net of allowances    
Concentration Risk [Line Items]    
Maximum exposure 416,910 474,055
Other taxes    
Concentration Risk [Line Items]    
Maximum exposure 69,692 69,987
Other current assets    
Concentration Risk [Line Items]    
Maximum exposure 22,494 21,405
Non-current financial assets    
Concentration Risk [Line Items]    
Maximum exposure 14,788 18,109
Marketable Securities    
Concentration Risk [Line Items]    
Maximum exposure $ 45,867 $ 41,809