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III. Financial Risk Management (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Statement Line Items [Line Items]      
Debt to equity ratio 0.06 0.04  
Reserve of exchange differences on translation $ 600 $ 1,900  
Total borrowings 822,152 539,007  
Gain (loss) on interest rate risk if market interest rates were higher (7,700) (8,200)  
Current trade receivables $ 1,348,160 $ 1,737,366 $ 1,214,060
Liquid financial assets, percentage 12.00% 7.00%  
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period $ 0    
Financial liabilities, fair value as a percentage of carrying value 100.00% 99.30%  
Reserve of cash flow hedges, continuing hedges $ 2,600 $ (900)  
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period $ 0    
UNITED STATES      
Statement Line Items [Line Items]      
Liquid financial assets, percentage denominated by a specific currency 95.00% 95.00%  
Allowance for doubtful accounts - trade receivables [member]      
Statement Line Items [Line Items]      
Total other provisions $ 48,800 $ 66,500  
Past due [member]      
Statement Line Items [Line Items]      
Current trade receivables 242,700 368,400  
Guarantees under credit insurance [member]      
Statement Line Items [Line Items]      
Current trade receivables 178,700 181,700  
Letter of credit and other bank guarantees [member]      
Statement Line Items [Line Items]      
Current trade receivables 55,200 62,300  
Other guarantees [member]      
Statement Line Items [Line Items]      
Current trade receivables 600 42,200  
Financial guarantee contracts [member] | Past due [member]      
Statement Line Items [Line Items]      
Current trade receivables 28,700 31,500  
Fixed interest rate [member]      
Statement Line Items [Line Items]      
Total borrowings 768,002 $ 520,471 [1]  
Current borrowings $ 728,000    
Concentration Risk, percentage [1] 93.00% 97.00%  
One percent change, Argentine Peso / U.S. dollar foreign exchange risk [member]      
Statement Line Items [Line Items]      
Foreign exchange risk, currency exposure $ 1,000 $ 1,900  
One percent change, Euro / U.S. dollar foreign exchange risk [member]      
Statement Line Items [Line Items]      
Foreign exchange risk, currency exposure 1,000 1,300  
One percent change, Saudi Arabian Riyal / U.S. dollar foreign exchange risk [member]      
Statement Line Items [Line Items]      
Foreign exchange risk, currency exposure 4,600 3,600  
One percent change, Saudi Arabian Riyal / U.S. dollar foreign exchange risk [member] | Foreign exchange derivatives contracts [member]      
Statement Line Items [Line Items]      
Foreign exchange risk, currency exposure 4,900 $ 2,300  
Customer concentration risk [member]      
Statement Line Items [Line Items]      
Credit exposure $ 0    
Concentration Risk, percentage 0.00% 0.00% 0.00%
Counterparty risk [member]      
Statement Line Items [Line Items]      
Concentration Risk, percentage 96.00% 83.00%  
[1] Out of the $768 million fixed rate borrowings, $728 million are short-term.