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Other intangible assets (Details) (EUR €) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cost |  |  |
Cost, Beginning Balance | € 107,245 | € 107,245 |
Additions | 7,658 |  |
Cost, Ending Balance | 114,903 | 107,245 | 107,245
Accumulated amortization |  |  |
Accumulated amortization, Beginning Balance | 98,879 | 93,594 |
Amortization | 6,081 | 5,285 | 5,500
Accumulated amortization, Ending Balance | 104,960 | 98,879 | 93,594
Carrying amount |  |  |
Carrying amount | 9,943 | 8,366 |
Intellectual property [Member] |  |  |
Cost |  |  |
Cost, Beginning Balance | 47,250 | 47,250 |
Additions | 7,658 |  |
Cost, Ending Balance | 54,908 | 47,250 |
Accumulated amortization |  |  |
Accumulated amortization, Beginning Balance | 47,228 | 47,224 |
Amortization | 800 | 4 |
Accumulated amortization, Ending Balance | 48,028 | 47,228 |
Carrying amount |  |  |
Carrying amount | 6,880 | 22 |
Developed technology [Member] |  |  |
Cost |  |  |
Cost, Beginning Balance | 25,883 | 25,883 |
Additions |  |  |
Cost, Ending Balance | 25,883 | 25,883 |
Accumulated amortization |  |  |
Accumulated amortization, Beginning Balance | 21,123 | 17,043 |
Amortization | 4,080 | 4,080 |
Accumulated amortization, Ending Balance | 25,203 | 21,123 |
Carrying amount |  |  |
Carrying amount | 680 | 4,760 |
Customer relationships [Member] |  |  |
Cost |  |  |
Cost, Beginning Balance | 8,733 | 8,733 |
Additions |  |  |
Cost, Ending Balance | 8,733 | 8,733 |
Accumulated amortization |  |  |
Accumulated amortization, Beginning Balance | 5,277 | 4,185 |
Amortization | 1,092 | 1,092 |
Accumulated amortization, Ending Balance | 6,369 | 5,277 |
Carrying amount |  |  |
Carrying amount | 2,364 | 3,456 |
In-process R&D [Member] |  |  |
Cost |  |  |
Cost, Beginning Balance | 23,148 | 23,148 |
Additions |  |  |
Cost, Ending Balance | 23,148 | 23,148 |
Accumulated amortization |  |  |
Accumulated amortization, Beginning Balance | 23,148 | 23,148 |
Amortization | 100 |  |
Accumulated amortization, Ending Balance | 23,148 | 23,148 |
Carrying amount |  |  |
Carrying amount | 0 | 0 |
Other [Member] |  |  |
Cost |  |  |
Cost, Beginning Balance | 2,231 | 2,231 |
Additions |  |  |
Cost, Ending Balance | 2,231 | 2,231 |
Accumulated amortization |  |  |
Accumulated amortization, Beginning Balance | 2,103 | 1,994 |
Amortization | 109 | 109 |
Accumulated amortization, Ending Balance | 2,212 | 2,103 |
Carrying amount |  |  |
Carrying amount | € 19 | € 128 |

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