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Trade and Other Receivables and Assets (Narrative) (Details) € in Thousands, $ in Thousands | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2016 USD ($) | Nov. 30, 2016 EUR (€) | Mar. 31, 2019 USD ($) | Mar. 31, 2019 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€)
Statement Line Items [Line Items] |  |  |  |  |  |
Accumulated profit from forward contracts |  | € 4,255 |  |  |  | € 497
Proceeds from forward contracts |  |  |  |  |  | € 2,647
Forward contract [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Proceeds from forward contracts |  |  |  | € 1,100 |  |
USD [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Accumulated profit from forward contracts | $ | $ 4,474 |  |  |  | $ 597 |
USD [Member] | Forward contract [Member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Proceeds from forward contracts | $ |  |  | $ 1,300 |  |  |

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- Definition The cash inflow from futures contracts, forward contracts, option contracts and swap contracts except when the contracts are held for dealing or trading purposes or the receipts are classified as financing activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_16_h&doctype=Standard -URIDate 2017-03-09 + Details
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