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Convertible Senior Notes - Net Carrying Amount (Details) - Shares related to convertible senior notes - USD ($) | Dec. 31, 2020 | Aug. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Apr. 30, 2018
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0% Convertible Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 1,000,000,000 | $ 1,000,000,000.0 |  |  |  |
Unamortized debt discount | (226,732,000) |  |  |  |  |
Unamortized issuance costs | (11,338,000) | (15,900,000) |  |  |  |
Debt discount for conversion option | 241,300,000 |  |  |  |  |
Issuance costs | (3,838,000) |  |  |  |  |
Net carrying amount (equity) | 237,462,000 | $ 241,300,000 |  |  |  |
0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | 800,000,000 |  | $ 800,000,000 |  | $ 700,000,000 |
Unamortized debt discount | (149,138,000) |  | (184,698,000) |  |  |
Unamortized issuance costs | (10,248,000) |  | (12,691,000) | $ (19,800,000) |  |
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 | $ 212,000,000.0 |  |
0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | 115,576,000 |  | 345,000,000 |  |  | $ 345,000,000
Unamortized debt discount | (9,953,000) |  | (42,280,000) |  |  |
Unamortized issuance costs | (1,245,000) |  | (5,028,000) |  |  | (9,400,000)
Debt discount for conversion option | 21,505,000 |  | 64,193,000 |  |  |
Issuance costs | (586,000) |  | (1,749,000) |  |  |
Net carrying amount (equity) | 20,919,000 |  | 62,444,000 |  |  | $ 64,200,000
Carrying Amount | Fair Value, Nonrecurring |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount (liability) | 1,506,922,000 |  | 900,303,000 |  |  |
Carrying Amount | Fair Value, Nonrecurring | 0% Convertible Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount (liability) | 761,930,000 |  | 0 |  |  |
Carrying Amount | Fair Value, Nonrecurring | 0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount (liability) | 640,614,000 |  | 602,611,000 |  |  |
Carrying Amount | Fair Value, Nonrecurring | 0.25% Convertible Senior Notes Due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount (liability) | $ 104,378,000 |  | $ 297,692,000 |  |  |

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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt discount (premium). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28567-108399 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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