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Senior convertible notes (Tables) | 6 Months Ended
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Jun. 30, 2013
Summary of Senior Convertible Notes | Senior convertible notes consist of the following (in thousands):
|  | June 30 2013 |  |  | December 31 2012 |
2013 notes |  |  |  |  |  |  |  |
Principal amount |  | $ | 115,000 |  |  | $ | 115,000 |
Unaccreted debt issuance expense |  |  | (256 | ) |  |  | (557 | )
Net carrying amount |  |  | 114,744 |  |  |  | 114,443 |
2015 notes |  |  |  |  |  |  |  |
Principal amount |  | $ | 100,000 |  |  | $ | 100,000 |
Unaccreted debt issuance expense |  |  | (1,996 | ) |  |  | (2,417 | )
Net carrying amount |  |  | 98,004 |  |  |  | 97,583 |
Senior convertible notes |  | $ | 212,748 |  |  | $ | 212,026 |
Accretion of Debt Issuance Expense | Accretion of debt issuance expense in connection with the offerings of the 2015 notes and the 2013 notes during the three and six months ended June 30, 2013 and 2012 were as follows (in thousands).
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Accretion expense |  | $ | 364 |  |  | $ | 343 |  |  | $ | 722 |  |  | $ | 682 |

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