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Convertible Notes (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Interest expense related to notes |  |  |  |  |
Amortization of discount and debt issuance costs |  |  | $ 5,324 | $ 5,025 |
Interest expense | $ 3,287 | $ 3,193 | 9,754 | 9,497 |
1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Interest | 388 | 388 | 1,164 | 1,164 |
Amortization of discount and debt issuance costs | 1,801 | 1,699 | 5,324 | 5,025 |
Interest expense | $ 2,189 | $ 2,087 | $ 6,488 | $ 6,189 |
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Convertible notes stated interest rate (as a percent) |  |  |  |  | 1.125%
Debt Instrument, Interest Rate, Effective Percentage |  | 5.50% |  | 5.50% |
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018 |  |  |  |  |
Interest expense related to notes |  |  |  |  |
Convertible notes stated interest rate (as a percent) | 1.125% |  | 1.125% |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% |  | 5.50% |  |

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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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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