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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Convertible Senior Notes | Convertible senior notes consist of the following (in thousands):
| December 31, 2017 |  | December 31, 2018
| Principal/ Fair Value Amount |  | Debt Issuance Costs |  | Net Amount |  | Principal/ Fair Value Amount |  | Debt Issuance Costs |  | Net Amount
4.25% convertible senior notes (due 2018) | $ | 21,178 |  |  | $ | 103 |  |  | $ | 21,075 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
4.875% convertible senior notes (due 2020) | 113,000 |  |  | 1,972 |  |  | 111,028 |  |  | 113,000 |  |  | 1,182 |  |  | 111,818 |
3.25% convertible senior notes (due 2020) * | 22,469 |  |  | — |  |  | 22,469 |  |  | 27,974 |  |  | — |  |  | 27,974 |
Total convertible senior notes, net of debt issuance costs | $ | 156,647 |  |  | $ | 2,075 |  |  | $ | 154,572 |  |  | $ | 140,974 |  |  | $ | 1,182 |  |  | $ | 139,792 |
* The amount presented for the 3.25% 2020 convertible senior notes within the table represents the fair value. The principal amount of these notes totals $21.5 million and $29.5 million
Components of Convertible Senior Notes | Key components of the 4.25% convertible senior notes due 2018 consist of the following (in thousands):
| Year ended December 31,
| 2016 |  | 2017 |  | 2018
Contractual interest expense | $ | 4,191 |  |  | $ | 2,184 |  |  | $ | 373 |
Amortization of debt issuance costs recognized as interest expense | 1,172 |  |  | 844 |  |  | 103 |
| $ | 5,363 |  |  | $ | 3,028 |  |  | $ | 476 |
Key components of the 4.875% convertible senior notes due 2020 consist of the following (in thousands):
| Year ended December 31,
| 2016 |  | 2017 |  | 2018
Contractual interest expense | $ | 5,508 |  |  | $ | 5,509 |  |  | $ | 5,509 |
Amortization of debt issuance costs recognized as interest expense | 804 |  |  | 789 |  |  | 789 |
| $ | 6,312 |  |  | $ | 6,298 |  |  | $ | 6,298 |
Key components of the 3.25% convertible senior notes due 2020 consist of the following (in thousands):
| Year ended December 31,
| 2016 |  | 2017 |  | 2018
Contractual interest expense | $ | — |  |  | $ | 103 |  |  | $ | 815 |
Amortization of debt issuance costs recognized as interest expense | — |  |  | — |  |  | — |
| $ | — |  |  | $ | 103 |  |  | $ | 815 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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) -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 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: 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 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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