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Operating segments - Operating segments, narrative (Details)
€ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
segment
Dec. 31, 2017
EUR (€)
segment
Dec. 31, 2016
EUR (€)
segment
Dec. 31, 2015
EUR (€)
customer
segment
Disclosure of major customers [line items]        
Number of operating segments | segment 2 2 2 2
Number of reportable segments | segment   2 2 2
Revenue   € 1,177,210 € 1,030,094 € 1,111,776
Rubber        
Disclosure of major customers [line items]        
Revenue   752,639 644,217 € 730,288
Number of largest customers | customer       2
Rubber | Customer Number One        
Disclosure of major customers [line items]        
Revenue   € 127,805 € 102,699 € 120,609
Rubber | Customer Number Two        
Disclosure of major customers [line items]        
Revenue       € 110,387