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Commitments, contingencies and other (Narrative) (Details) (EUR €) In Thousands, unless otherwise specified | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended
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Mar. 21, 2011 claim | Jan. 30, 2013 BELGIUM Foreign Tax Authority [Member] | May 20, 2014 BELGIUM Foreign Tax Authority [Member] Two Thousand and Eight [Member] | Jan. 31, 2012 BELGIUM Foreign Tax Authority [Member] Two Thousand and Eight [Member] | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] Two Thousand and Five [Member] | Dec. 28, 2012 BELGIUM Foreign Tax Authority [Member] Two Thousand and Nine [Member] | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] Two Thousand and Six [Member] | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] Two Thousand and Seven [Member] | Dec. 31, 2013 BELGIUM Foreign Tax Authority [Member] Two Thousand and Ten [Member]
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of class action complaints | 2 |  |  |  |  |  |  |  |
Assessment received from Belgian tax authority (in euros) |  |  | € 30,132 | € 23,789 | € 46,135 | € 35,567 | € 38,817 | € 39,635 | € 43,117
Interest income earned on deposits related to tax assessment |  | € 1,583 |  |  |  |  |  |  |

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- Definition Foreign Tax Assessment + References No definition available. + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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