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Convertible Senior Notes - Net Carrying Amount (Details) - Shares related to convertible senior notes - USD ($) | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2018
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0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 800,000,000 |  | $ 700,000,000 |  |
Unamortized debt discount | (184,698,000) |  |  |  |
Unamortized issuance costs | (12,691,000) |  |  |  |
Debt discount for conversion option | 212,000,000 |  |  |  |
Issuance costs | (5,253,000) |  |  |  |
Net carrying amount | 206,747,000 | $ 212,000,000.0 |  |  |
0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | 345,000,000 |  |  | $ 345,000,000 | $ 345,000,000
Unamortized debt discount | (42,280,000) |  |  | (54,817,000) |
Unamortized issuance costs | (5,028,000) |  |  | (6,515,000) |
Debt discount for conversion option | 64,193,000 |  |  | 64,193,000 |
Issuance costs | (1,749,000) |  |  | (1,749,000) |
Net carrying amount | 62,444,000 |  |  | 62,444,000 | $ 64,200,000
Carrying Amount | Fair Value, Nonrecurring |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount (liability) | 900,303,000 |  |  | 283,668,000 |
Carrying Amount | Fair Value, Nonrecurring | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount (liability) | 602,611,000 |  |  | 0 |
Carrying Amount | Fair Value, Nonrecurring | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net carrying amount (liability) | $ 297,692,000 |  |  | $ 283,668,000 |

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