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Fair value measurements (Details) (EUR €) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2007
Assets |  |  |  |  |  |
Derivative financial instruments | € 151,748,000 |  | € 126,351,000 |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 759,490,000 |  | 736,368,000 |  |  |
Derivative financial instruments | 10,893,000 |  | 40,359,000 |  |  |
Fair value measurements (Textual) [Abstract] |  |  |  |  |  |
Percentage of hedged senior notes | 5.75% |  |  |  |  |
Senior notes due, year of maturity | 2017 |  |  |  |  |
Impairment charges on property, plant and equipment | 3,234,000 |  | 12,272,000 |  | 8,600,000 |
Impairment of goodwill and other intangible asset | 0 |  |  |  |  |
Principal amount | 600,000,000 |  |  |  |  | 600,000,000
Carrying amount | 710,095,000 |  | 695,618,000 |  |  |
Estimated fair value of assets | 100,000 |  |  |  |  |
Transfers between levels | 0 |  | 0 |  |  |
Recurring [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments | 151,748,000 | [1] | 126,351,000 | [1] |  |
Money market funds | 385,420,000 | [2] | 369,238,000 | [2] |  |
Short-term investments | 930,005,000 | [3] |  | [3] |  |
Total | 1,467,173,000 |  | 495,589,000 |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 759,490,000 | [4] | 736,368,000 | [4] |  |
Derivative financial instruments | 10,893,000 | [1] | 40,359,000 | [1] |  |
Total | 770,383,000 |  | 776,727,000 |  |  |
Recurring [Member] | Level 1 [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  | [1] |  | [1] |  |
Money market funds | 385,420,000 | [2] | 369,238,000 | [2] |  |
Short-term investments | 279,988,000 | [3] |  | [3] |  |
Total | 665,408,000 |  | 369,238,000 |  |  |
Liabilities |  |  |  |  |  |
Long-term debt |  | [4] |  | [4] |  |
Derivative financial instruments |  | [1] |  | [1] |  |
Total |  |  |  |  |  |
Recurring [Member] | Level 2 [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments | 151,748,000 | [1] | 126,351,000 | [1] |  |
Money market funds |  | [2] |  | [2] |  |
Short-term investments | 650,017,000 | [3] |  | [3] |  |
Total | 801,765,000 |  | 126,351,000 |  |  |
Liabilities |  |  |  |  |  |
Long-term debt | 759,490,000 | [4] | 736,368,000 | [4] |  |
Derivative financial instruments | 10,893,000 | [1] | 40,359,000 | [1] |  |
Total | 770,383,000 |  | 776,727,000 |  |  |
Recurring [Member] | Level 3 [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Derivative financial instruments |  | [1] |  | [1] |  |
Money market funds |  | [2] |  | [2] |  |
Short-term investments |  | [3] |  | [3] |  |
Total |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Long-term debt |  | [4] |  | [4] |  |
Derivative financial instruments |  | [1] |  | [1] |  |
Total |  |  |  |  |  |
[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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