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Guarantee commitments to third parties and contingent liabilities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
item
employee
case
Dec. 31, 2017
USD ($)
Guarantee commitments to third parties and other contingent assets and liabilities    
Bank guarantees commitments to third parties | $ $ 14,427 $ 18,943
Number of employees | employee 93  
Number of case closed | case 61  
Number of faute inexcusable | item 13  
Statutory maximum penalty per day per violation of standard provisions | $ $ 93,750  
Asbestos-related claims    
Guarantee commitments to third parties and other contingent assets and liabilities    
Number of claims pending | item 32  
Number of grave cases | item 3  
Bond to guarantee civil financial responsibility | $ $ 1,775