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Convertible Senior Notes (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | May 31, 2020 | May 29, 2020 | May 18, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2018
Convertible Senior Notes |  |  |  |  |  |  |
Net carrying amount | $ 142,704 |  |  |  | $ 110,246 |  |
3.75% Convertible Senior Notes |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |
Principal amount | 212,463 |  | $ 12,500 | $ 200,000 |  |  |
Unamortized debt discount | (133,321) |  |  |  |  |  |
Unamortized debt issuance costs | (2,517) |  |  |  |  |  |
Net carrying amount | 76,625 |  |  |  |  |  |
Carrying amount of the equity component | 130,249 |  |  | 130,300 |  |  |
7.5% Convertible Senior Note |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |
Principal amount | 48,000 | $ 100,000 |  |  | 48,000 | $ 40,000 |
Unamortized debt discount | (6,200) |  |  |  | (7,400) |  |
Unamortized debt issuance costs | (812) |  |  |  | (969) |  |
Net carrying amount | 40,988 |  |  |  | 39,631 |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |
Principal amount | 33,660 | 1,000 |  | $ 100,000 | 100,000 |  | $ 100,000
Unamortized debt discount | (8,126) |  |  |  | (27,818) |  |
Unamortized debt issuance costs | (443) |  |  |  | (1,567) |  |
Net carrying amount | 25,091 |  |  |  | 70,615 |  |
Carrying amount of the equity component |  | $ 37,700 |  |  | $ 37,702 |  |
Income tax benefit on equity component | $ 9,200 |  |  |  |  |  |

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