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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2017
Convertible Senior Notes | Convertible senior notes consist of the following (in thousands):
|  | September 30, 2017 |  |  | December 31, 2016 |
|  | Principal Amount |  |  | Debt Issuance Costs |  |  | Net Amount |  |  | Principal Amount |  |  | Debt Issuance Costs |  |  | Net Amount |
4.25% convertible senior notes (due 2018) |  | $ | 42,728 |  |  | $ | 298 |  |  | $ | 42,430 |  |  | $ | 93,865 |  |  | $ | 1,098 |  |  | $ | 92,767 |
4.875% convertible senior notes (due 2020) |  |  | 113,000 |  |  |  | 2,169 |  |  |  | 110,831 |  |  |  | 113,000 |  |  |  | 2,760 |  |  |  | 110,240 |
Total |  | $ | 155,728 |  |  | $ | 2,467 |  |  | $ | 153,261 |  |  | $ | 206,865 |  |  | $ | 3,858 |  |  | $ | 203,007 |

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