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Investee Companies and other investments (Pumped Storage Projects) (Narrative) (Details)
€ in Thousands, ₪ in Thousands
1 Months Ended 12 Months Ended
Jun. 02, 2017
EUR (€)
Mar. 03, 2017
EUR (€)
Nov. 03, 2014
Dec. 27, 2017
ILS (₪)
Dec. 27, 2017
EUR (€)
Jul. 31, 2014
ILS (₪)
Jul. 31, 2014
EUR (€)
May 20, 2014
Jan. 28, 2014
Jan. 19, 2014
Nov. 30, 2013
ILS (₪)
Installment
Nov. 30, 2013
EUR (€)
Installment
Jul. 17, 2013
ILS (₪)
Dec. 31, 2017
ILS (₪)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
ILS (₪)
Dec. 31, 2016
EUR (€)
Jul. 17, 2013
EUR (€)
Disclosure of subsidiaries [line items]                                    
Amount of loan                             € 44,864   € 17,737  
Repayment of loan and accrued interest                             (1,892)      
NIS [Member] | Kochav Hayarden's [Member]                                    
Disclosure of subsidiaries [line items]                                    
Claims damages | ₪       ₪ 4,238                            
Euro [Member] | Kochav Hayarden's [Member]                                    
Disclosure of subsidiaries [line items]                                    
Claims damages         € 1,020                          
Euro [Member] | Kochav Pumped Storage [Member]                                    
Disclosure of subsidiaries [line items]                                    
Claims damages         1,020                          
Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Amount of Acquisition                             825      
Remaining amount of Acquisition                             14,882      
Pumped Storage Projects [Member] | NIS [Member]                                    
Disclosure of subsidiaries [line items]                                    
Amount of Acquisition | ₪                               ₪ 3,400    
Remaining amount of Acquisition | ₪                               ₪ 61,800    
Erez Electricity Ltd [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of share capital holds                         24.00%          
Amount of loan                                   € 164
Repayment of loan and accrued interest                       € 200            
Additional compensation aggregate amount                       € 1,400            
Number of installments | Installment                     2 2            
Erez Electricity Ltd [Member] | Pumped Storage Projects [Member] | First Installment [Member]                                    
Disclosure of subsidiaries [line items]                                    
Compensation paid                       € 250            
Compensation received             € 260                      
Erez Electricity Ltd [Member] | Pumped Storage Projects [Member] | Second Installment [Member]                                    
Disclosure of subsidiaries [line items]                                    
Compensation paid                       € 1,160            
Compensation received                             € 1,249      
Erez Electricity Ltd [Member] | Pumped Storage Projects [Member] | NIS [Member]                                    
Disclosure of subsidiaries [line items]                                    
Amount of loan | ₪                         ₪ 770          
Repayment of loan and accrued interest | ₪                     ₪ 1,000              
Additional compensation aggregate amount | ₪                     6,700              
Erez Electricity Ltd [Member] | Pumped Storage Projects [Member] | NIS [Member] | First Installment [Member]                                    
Disclosure of subsidiaries [line items]                                    
Compensation paid | ₪                     1,200              
Compensation received | ₪           ₪ 1,200                        
Erez Electricity Ltd [Member] | Pumped Storage Projects [Member] | NIS [Member] | Second Installment [Member]                                    
Disclosure of subsidiaries [line items]                                    
Compensation paid | ₪                     ₪ 5,500              
Compensation received | ₪                           ₪ 5,188        
Galilee Development Cooperative Ltd. [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of acquire cooperatives holdings                   24.75%                
Ortam's holdings [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of acquire cooperatives holdings                 24.75% 25.00%                
EPC [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of acquire cooperatives holdings     50.00%         50.00% 50.00% 50.00%                
Chashgal Elyon Ltd. [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of acquire cooperatives holdings               25.00% 25.00%                  
Electra's holdings [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of share capital holds     100.00%                              
Percentage of acquire cooperatives holdings     75.00%         24.75%                    
Sheva Mizrakot Ltd [Member] | Pumped Storage Projects [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of acquire cooperatives holdings     25.00%                              
Ellomay Pumped Storage [Member]                                    
Disclosure of subsidiaries [line items]                                    
Percentage of subsidiary owned                               75.00%    
Licence period                               72 months    
Ellomay Pumped Storage [Member] | NIS [Member] | Kochav Hayarden's [Member]                                    
Disclosure of subsidiaries [line items]                                    
Obligated post bond for damages € 2,000 € 10,000                                
Kochav Pumped Storage [Member] | NIS [Member]                                    
Disclosure of subsidiaries [line items]                                    
Claims damages         € 4,200