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Debt - Components of Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jan. 31, 2018
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Debt Instrument [Line Items] |  |  |
1.75% convertible senior notes due 2025 | $ 450,000 | $ 450,000 |
Debt issuance costs, unamortized | (6,345) | (7,043) |
Discount on debt | (97,654) | (107,017) |
Debt, long-term | 346,001 | $ 335,940 |
Convertible Notes |  |  |
Debt Instrument [Line Items] |  |  |
Discount on debt | $ (97,700) |  |
Convertible Notes | 1.75 convertible senior notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (as a percent) | 1.75% |  |
Debt issuance costs, unamortized |  |  | $ (14,200)

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