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Financial Risk Management (Details Textual)
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Jan. 01, 2018
USD ($)
Statement Line Items [Line Items]        
Debt to equity ratio 0.04 0.08    
Foreign exchange risk, currency exposure $ 3,600,000 $ 5,300,000    
Reserve of exchange differences on translation 1,900,000 3,400,000    
Total borrowings 539,007,000 965,859,000    
Gain (loss) on interest rate risk if market interest rates were higher (8,200,000) (8,000,000)    
Current trade receivables $ 1,737,366,000 $ 1,214,060,000   $ 1,214,060,000
Liquid financial assets, percentage 7.00% 11.00%    
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 99.30% 99.40%    
Reserve of cash flow hedges, continuing hedges $ (900,000) $ (200,000)    
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% 93.00%    
Allowance for doubtful accounts - trade receivables [member]        
Statement Line Items [Line Items]        
Other provisions at end of period $ 66,500,000 $ 78,400,000    
Past due [member]        
Statement Line Items [Line Items]        
Current trade receivables 368,400,000 230,900,000    
Past due up to 15 days [member]        
Statement Line Items [Line Items]        
Current trade receivables 139,000,000 50,000,000    
Past due over 15 days [member]        
Statement Line Items [Line Items]        
Current trade receivables 229,400,000 180,900,000    
Guarantees under credit insurance [member]        
Statement Line Items [Line Items]        
Current trade receivables 181,700,000 190,700,000    
Letter of credit and other bank guarantees [member]        
Statement Line Items [Line Items]        
Current trade receivables 62,300,000 42,200,000    
Other guarantees [member]        
Statement Line Items [Line Items]        
Current trade receivables 42,200,000 14,100,000    
Financial guarantee contracts [member] | Past due [member]        
Statement Line Items [Line Items]        
Current trade receivables 31,500,000 27,300,000    
Fixed interest rate [member]        
Statement Line Items [Line Items]        
Total borrowings 520,471,000 $ 946,215,000 [1]    
Current borrowings $ 493,000,000      
Concentration Risk, percentage [1] 97.00% 98.00%    
Foreign exchange derivatives contracts [member]        
Statement Line Items [Line Items]        
Foreign exchange risk, currency exposure $ 2,300,000 $ 6,700,000    
One percent change, Argentine Peso / U.S. dollar foreign exchange risk [member]        
Statement Line Items [Line Items]        
Foreign exchange risk, currency exposure 1,900,000 600,000    
One percent change, Euro / U.S. dollar foreign exchange risk [member]        
Statement Line Items [Line Items]        
Foreign exchange risk, currency exposure 1,300,000 $ 3,700,000    
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 83.00% 71.00%    
[1] Out of the $520 million fixed rate borrowings $493 million are short-term.