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Convertible Notes (Details 3) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Interest expense related to notes |  |  |
Amortization of discount and debt issuance costs | $ 2,680 | $ 1,749 |
Interest expense | 4,421 | 3,206 |
1.125% Convertible Senior Notes due 2018 |  |  |
Interest expense related to notes |  |  |
Interest | 53 | 388 |
Amortization of discount and debt issuance costs | 1,090 | 1,749 |
Interest expense | $ 3,326 | $ 2,137 |
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% |  |
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 | $ 0 |
Amortization of discount and debt issuance costs | $ 1,590 | $ 0 |
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% | 1.125% | 1.125%
Debt Instrument, Interest Rate, Effective Percentage | 5.50% |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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