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Fair value measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair value measurements [Abstract] |
Financial assets and financial liabilities that are measured at fair value on a recurring basis |
As of December 31, 2012 (in thousands) |  | Level 1 EUR |  | Level 2 EUR |  | Level 3 EUR |  | Total EUR |
Assets |  |  |  |  |  |  |  |  |  |
Derivative financial instruments 1 |  | - |  | 151,748 |  | - |  |  | 151,748 |
Money market funds 2 |  | 385,420 |  | - |  | - |  |  | 385,420 |
Short-term investments 3 |  | 279,988 |  | 650,017 |  | - |  |  | 930,005 |
Total |  | 665,408 |  | 801,765 |  | - |  |  | 1,467,173 |
Liabilities |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | - |  | 759,490 |  | - |  |  | 759,490 |
Derivative financial instruments 1 |  | - |  | 10,893 |  | - |  |  | 10,893 |
Total |  | - |  | 770,383 |  | - |  |  | 770,383 |
As of December 31, 2011 (in thousands) |  | Level 1 EUR |  | Level 2 EUR |  | Level 3 EUR |  | Total EUR |
Assets |  |  |  |  |  |  |  |  |  |
Derivative financial instruments 1 |  | - |  | 126,351 |  | - |  |  | 126,351 |
Money market funds 2 |  | 369,238 |  | - |  | - |  |  | 369,238 |
Total |  | 369,238 |  | 126,351 |  | - |  |  | 495,589 |
Liabilities |  |  |  |  |  |  |  |  |  |
Long-term debt 4 |  | - |  | 736,368 |  | - |  |  | 736,368 |
Derivative financial instruments 1 |  | - |  | 40,359 |  | - |  |  | 40,359 |
Total |  | - |  | 776,727 |  | - |  |  | 776,727 |
1 | Derivative financial instruments consist of forward foreign exchange contracts and interest rate swaps. See Note 3.
2 | Money market funds are part of our cash and cash equivalents.
3 | Short-term investments consist of Dutch Treasury Certificates and deposits with the Dutch government.
4 | Long-term debt mainly relates to our EUR 600.0 million Eurobond (fair value as at December 31, 2012: EUR 710.1 million (2011: EUR 695.6 million)) and excludes accrued interest. For further details see Note 14.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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