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Convertible Notes (Details 3) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Interest expense related to notes |  |
Amortization of discount and debt issuance costs | $ 1,678 | $ 2,680
Interest expense | 2,271 | 4,421
1.125% Convertible Senior Notes due 2018 |  |
Interest expense related to notes |  |
Interest | 0 | 53
Amortization of discount and debt issuance costs | $ 0 | 1,090
Convertible Notes Payable [Member] |  |
Interest expense related to notes |  |
Interest expense |  | $ 3,326
Convertible Notes Payable [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |
Interest expense related to notes |  |
Convertible notes stated interest rate (as a percent) | 1.375% | 1.375%
Debt Instrument, Interest Rate, Effective Percentage | 4.90% | 4.90%
Convertible Notes Payable [Member] | 1.125% Convertible Senior Notes due 2018 |  |
Interest expense related to notes |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 5.50%
Convertible Senior Notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |
Interest expense related to notes |  |
Interest | $ 593 | $ 593
Amortization of discount and debt issuance costs | $ 1,678 | $ 1,590
Convertible Notes Payable [Member] | 1.125% Convertible Senior Notes due 2018 |  |
Interest expense related to notes |  |
Convertible notes stated interest rate (as a percent) |  | 1.125%

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