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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($) | Mar. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Apr. 30, 2018
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0.125% Convertible Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal | $ 800,000,000 | $ 800,000,000 | $ 100,000,000 | $ 700,000,000 |
Unamortized debt discount | (175,857,000) | (184,698,000) |  |  |
Unamortized issuance costs | (12,084,000) | (12,691,000) |  |  |
Debt discount for conversion option | 212,000,000 | 212,000,000 |  |  |
Issuance costs | (5,253,000) | (5,253,000) |  |  |
Net carrying amount (equity) | 206,747,000 | 206,747,000 |  |  |
0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal | 345,000,000 | 345,000,000 |  |  | $ 345,000,000
Unamortized debt discount | (39,155,000) | (42,280,000) |  |  |
Unamortized issuance costs | (4,655,000) | (5,028,000) |  |  |
Debt discount for conversion option | 64,193,000 | 64,193,000 |  |  |
Issuance costs | (1,749,000) | (1,749,000) |  |  |
Net carrying amount (equity) | 62,444,000 | 62,444,000 |  |  |
Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount (liability) | 913,249,000 | 900,303,000 |  |  |
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.125% Convertible Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount (liability) | 612,059,000 | 602,611,000 |  |  |
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount (liability) | $ 301,190,000 | $ 297,692,000 |  |  |

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