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Cash and cash equivalents and short-term investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Cash and cash equivalents and short-term investments [Abstract] |
Short-term investments |
As of December 31, 2012 (in thousands) |  | Cost basis |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Recorded Basis |
Dutch Treasury Certificates |  |  | 279,988 |  |  |  | - |  |  |  | - |  |  |  | 279,988 |
Deposits |  |  | 650,017 |  |  |  | - |  |  |  | - |  |  |  | 650,017 |
Total |  |  | 930,005 |  |  |  | - |  |  |  | - |  |  |  | 930,005 |

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- Definition Tabular disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References No definition available. + Details
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