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III. Financial Risk Management (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Debt to equity ratio 0.05 0.06  
Reserve of exchange differences on translation $ 2,300 $ 600  
Total borrowings 619,007 822,152  
Gain (loss) on interest rate risk if market interest rates were higher $ (7,100) $ (7,700)  
Concentration Risk, percentage 88.00% 96.00%  
Current trade receivables $ 968,148 $ 1,348,160 $ 1,737,366
Liquid financial assets, percentage 12.00% 12.00%  
Financial liabilities, fair value as a percentage of carrying value 100.00% 100.00%  
Reserve of cash flow hedges, continuing hedges $ (4,800) $ 2,600  
UNITED STATES      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Liquid financial assets, percentage denominated by a specific currency 95.00% 95.00%  
Allowance for doubtful accounts - trade receivables [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Current trade receivables $ 53,700 $ 48,800  
Past due [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Current trade receivables 195,900 242,700  
Guarantees under credit insurance [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Current trade receivables 134,900 178,700  
Letter of credit and other bank guarantees [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Current trade receivables 47,800 55,200  
Other guarantees [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Current trade receivables 8,800 600  
Financial guarantee contracts [member] | Past due [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Current trade receivables 20,700 28,700  
Fixed interest rate [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Total borrowings [1] 237,320 $ 768,002  
Current borrowings $ 197,000    
Concentration Risk, percentage [1] 38.00% 93.00%  
One percent change, Argentine Peso / U.S. dollar foreign exchange risk [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Reserve of exchange differences on translation $ 400 $ 1,000  
One percent change, Euro / U.S. dollar foreign exchange risk [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Foreign exchange risk, currency exposure 2,900 1,000  
One percent change, Saudi Arabian Riyal / U.S. dollar foreign exchange risk [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Foreign exchange risk, currency exposure 5,100 4,600  
One percent change, Saudi Arabian Riyal / U.S. dollar foreign exchange risk [member] | Foreign exchange derivatives contracts [member]      
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]      
Foreign exchange risk, currency exposure $ 1,000 $ 4,900  
[1] Out of the $237 million fixed rate borrowings, $197 million are short-term.