Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Fixed assets (Narrative) (Details)

v3.8.0.1
Fixed assets (Narrative) (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2017
EUR (€)
Plants
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
[1]
Disclosure of detailed information about property, plant and equipment [line items]      
Fixed Assets € 78,837 € 73,274 [1] € 72,564
Capitalized borrowing costs 336    
Photovoltaic Plants [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Fixed Assets 87,922    
Biogas Installations [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Fixed Assets 15,157    
Biogas Installations [Member] | Major purchases of assets [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Fixed Assets € 633    
Italy and Spain [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Number of plants acquired | Plants 17    
Depreciation expenses € 4,396    
Italy [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Fixed Assets € 48,555 52,122  
Useful lives 20 years    
Spain [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Fixed Assets € 15,214 € 16,041  
Useful lives 25 years    
Netherlands [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Depreciation expenses € 111    
Useful lives 12 years    
[1] Please refer to note 2C for functional and presentation currency.