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Financial Instruments (Schedule of Forward and SWAP Contracts) (Details) € in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€)
Disclosure of detailed information about hedges [line items] |  |  |
Interest Swap transaction |  | € 44,864 | € 17,737
Interest swap contract [Member] | Amortized semi-annually [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Currency linkage interest rate receivable | Euribor 6 months |  |
Currency linkage interest rate payable | Fixed 2.67% |  |
Date of expiration | September 7, 2027 |  |
Fair value | $ | $ (28) |  |
Interest swap transaction period | 17 years |  |
Interest swap contract [Member] | Amortized semi-annually [Member] | Euro [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Interest Swap transaction |  | 8,000 |
Interest swap contract [Member] | Amortized quarterly [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Currency linkage interest rate receivable | Euribor 3 months |  |
Currency linkage interest rate payable | Fixed 3.595% |  |
Date of expiration | April 3, 2028 |  |
Fair value | $ | $ (20) |  |
Interest swap transaction period | 17 years |  |
Interest swap contract [Member] | Amortized quarterly [Member] | Euro [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Interest Swap transaction |  | 10,000 |
Interest swap contract [Member] | Semi-annually [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Currency linkage interest rate receivable | Euribor 6 months |  |
Currency linkage interest rate payable | Fixed 2.53% |  |
Date of expiration | June 30, 2027 |  |
Fair value | $ | $ (269) |  |
Interest swap transaction period | 15 years |  |
Interest swap contract [Member] | Semi-annually [Member] | Euro [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Interest Swap transaction |  | 3,750 |
Interest rate swap contract [Member] | Semi-annually [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Currency linkage interest rate receivable | Euribor 6 months |  |
Currency linkage interest rate payable | Fixed 1.17% |  |
Date of expiration | December 31, 2027 |  |
Fair value | $ | $ (222) |  |
Interest swap transaction period | 12 years |  |
Interest rate swap contract [Member] | Semi-annually [Member] | Euro [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Interest Swap transaction |  | 7,500 |
Forward contract [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Currency linkage interest rate payable | weighted average rate of approximately 1.18 |  |
Date of expiration | November 2021 |  |
Fair value |  | (2,650) |
Forward contract [Member] | Euro [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Interest Swap transaction |  | 20,000 |
Currency swap [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Currency linkage interest rate receivable | NIS |  |
Currency linkage interest rate payable | Euro |  |
Date of expiration | June 30, 2024 |  |
Fair value |  | € (1,244) |
Interest swap transaction period | 7 years |  |

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