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Debentures (Narrative) (Details) ₪ / shares in Units, € in Thousands, ₪ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Mar. 14, 2017 ILS (₪) | Mar. 14, 2017 EUR (€) | Sep. 30, 2018 | Jun. 30, 2018 | Jun. 19, 2014 ILS (₪) | Jun. 19, 2014 EUR (€) | Jan. 31, 2014 ILS (₪) ₪ / shares | Jan. 31, 2014 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€) | Dec. 31, 2015 EUR (€) | [1] | Dec. 31, 2017 USD ($) | Dec. 31, 2017 ILS (₪) | Dec. 31, 2017 EUR (€) | Nov. 14, 2017 | Mar. 14, 2017 EUR (€) | Dec. 31, 2014 EUR (€) | [1] | Jun. 19, 2014 USD ($) | Jun. 19, 2014 ILS (₪) ₪ / shares | Jun. 19, 2014 EUR (€) | Jan. 31, 2014 EUR (€) | Dec. 31, 2010
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured non convertible debentures |  |  |  |  |  |  |  |  |  | € 33,806 |  |  |  |  | € 57,631 |  |  |  |  |  |  |  |
Net proceeds from offering |  |  |  |  |  |  |  |  | € 31,175 |  | [1] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.50% |  |  | 3.50% | 3.50% | 3.50% |  |  |  |  |  |  |  | 3.43%
Equity |  |  |  |  |  |  |  |  |  | € 84,371 | [1] | € 86,442 |  |  | € 77,500 |  |  | € 77,479 |  |  |  |  |
Bottom of range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 1.60% |  |  | 1.60% | 1.60% | 1.60% |  |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 3.50% |  |  | 3.50% | 3.50% | 3.50% |  |  |  |  |  |  |  |
Series A Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured non convertible debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 17,115 | € 25,170 |
Gross proceeds from offering |  |  |  |  |  | € 17,286 |  | € 24,490 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from offering |  |  |  |  |  | € 16,808 |  | € 24,059 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% | 4.60% | 4.60% |  |
Obligation to pay additional interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 1.00% | 1.00% |  |
Amount of distribution of equity | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000 |  |  |  |
Percentage of distributable profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% | 75.00% | 75.00% |  |
Equity | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,000 |  |  |  |  |  |  |  |  |  |
Series A Debentures [Member] | Bottom of range [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity on consolidated basis |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00% |  |  |  |  |  |  |  |
Series A Debentures [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity on consolidated basis |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% | 65.00% | 65.00% |  |  |  |  |  |  |  |
Series A Debentures [Member] | NIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured non convertible debentures | ₪ |  |  |  |  |  |  | ₪ 120,000 |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 80,341 |  |  |
Debenture issued per unit price | ₪ / shares |  |  |  |  |  |  | ₪ 973 |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 1,010 |  |  |
Principal amount of each unit comprised | ₪ |  |  |  |  |  |  | ₪ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from offering | ₪ |  |  |  |  | ₪ 81,144 |  | 116,760 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from offering | ₪ |  |  |  |  | ₪ 78,900 |  | ₪ 114,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Debentures [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured non convertible debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 31,700 |  |  |  |  |  |
Net proceeds from offering |  | € 31,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 3.44% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.44% |  |  |  |  |  |
Equity | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,000 |  |  |  |  |  |  |  |  |  |
Debentures payable term | Series B Debentures is repayable in six (6) annual installments as follows: on June 30 of each of the years 2019-2022 (inclusive) 15% of the Principal shall be paid, and on June 30 of each of 2023-2024 (inclusive) 20% of the Principal shall be paid, and is not linked to the CPI or otherwise. The interest on the Series B Debentures is payable semi-annually on June 30 and December 31 of each of the years 2017 through June 30, 2024 (inclusive). | Series B Debentures is repayable in six (6) annual installments as follows: on June 30 of each of the years 2019-2022 (inclusive) 15% of the Principal shall be paid, and on June 30 of each of 2023-2024 (inclusive) 20% of the Principal shall be paid, and is not linked to the CPI or otherwise. The interest on the Series B Debentures is payable semi-annually on June 30 and December 31 of each of the years 2017 through June 30, 2024 (inclusive). |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in percentage of interest | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in interest percentage due to security rating | 1.75% | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 20,043 |  |  |  |  |  |  |  |
Series B Debentures [Member] | Net Financial Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of immediate repayment provision |  |  | 60.00% | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest increase provision |  |  | 55.00% | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Debentures [Member] | Company's balance sheet [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of immediate repayment provision |  |  | 25.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest increase provision |  |  | 30.00% | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Debentures [Member] | Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |
Series B Debentures [Member] | NIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured non convertible debentures | ₪ | ₪ 123,232 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from offering | ₪ | 123,232 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from offering | ₪ | ₪ 121,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | ₪ |  |  |  |  |  |  |  |  |  |  |  |  |  | ₪ 83,232 |  |  |  |  |  |  |  |  |
[1] | Please refer to note 2C for functional and presentation currency.

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