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Senior convertible notes (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Senior Convertible Notes | Senior convertible notes consist of the following (in thousands):
|  | December 31, |
|  | 2011 |  |  | 2012 |
2013 notes |  |  |  |  |  |  |  |
Principal amount |  | $ | 115,000 |  |  | $ | 115,000 |
Unaccreted debt issuance expense |  |  | (1,140 | ) |  |  | (557 | )
Net carrying amount |  |  | 113,860 |  |  |  | 114,443 |
2015 notes |  |  |  |  |  |  |  |
Principal amount |  | $ | 100,000 |  |  | $ | 100,000 |
Unaccreted debt issuance expense |  |  | (3,218 | ) |  |  | (2,417 | )
Net carrying amount |  |  | 96,782 |  |  |  | 97,583 |
Senior convertible notes |  | $ | 210,642 |  |  | $ | 212,026 |

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