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Notes to the statement of financial position - Pension provisions and post-retirement benefits narrative (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
Dec. 31, 2017
year
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
Dec. 31, 2016
year
Dec. 31, 2016
program
Dec. 31, 2015
EUR (€)
Disclosure of geographical areas [line items]                
Defined benefit obligation maturity duration   21.2 21.2   21.9 21.9    
Actual return on plan assets € 91     € 106        
Number of programs ceased due to closure of France plant | program             1  
Expected pension contributions 1,667              
Statutory pension insurance paid € 11,333     € 11,522       € 11,091
Germany                
Disclosure of geographical areas [line items]                
Percentage of provisions for defined benefit pension obligations 89.00% 89.00% 89.00% 89.00% 89.00% 89.00% 89.00%