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Convertible Notes (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Interest expense related to notes |  |  |  |  |
Amortization of discount and debt issuance costs |  |  | $ 3,523 | $ 3,326 |
Interest expense | $ 3,261 | $ 3,163 | 6,467 | 6,304 |
Convertible Senior Notes |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Interest expense | 2,162 | 2,063 | 4,299 | 4,102 |
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Interest | 388 | 388 | 776 | 776 |
Amortization of discount and debt issuance costs | $ 1,774 | $ 1,675 | $ 3,523 | $ 3,326 |
Convertible notes stated interest rate (as a percent) | 1.125% |  | 1.125% |  | 1.125%
Debt Instrument, Interest Rate, Effective Percentage | 5.50% | 5.50% | 5.50% | 5.50% |

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