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Cash and cash equivalents and short-term investments (Details) (EUR €) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Short-term Investments |  |
Cost basis | € 930,005 |
Unrealized Gains |  |
Unrealized Losses |  |
Recorded Basis | 930,005 |
Deposits [Member] |  |
Short-term Investments |  |
Cost basis | 650,017 |
Unrealized Gains |  |
Unrealized Losses |  |
Recorded Basis | 650,017 |
Dutch Treasury Certificates [Member] |  |
Short-term Investments |  |
Cost basis | 279,988 |
Unrealized Gains |  |
Unrealized Losses |  |
Recorded Basis | € 279,988 |

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