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v3.20.4

Convertible Senior Notes - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Sep. 25, 2020 USD ($) day $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Proceeds from issuance of convertible senior notes, net of issuance costs |  | $ 559,665,000 | $ 0 | $ 0
Debt issuance costs incurred and capitalized |  | 550,000 | 2,321,000 | 0
Purchase of convertible note hedge | $ 100,600,000 | 100,625,000 |  |
Proceeds from sale of warrants | 51,300,000 | 51,290,000 | $ 0 | $ 0
Convertible Note Hedge |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Deferred tax asset related to the convertible note hedge transaction | $ 25,800,000 |  |  |
Convertible Note Hedge Rights |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Options and warrants to purchase shares (in shares) | shares | 5,900,000 |  |  |
Strike price (in dollars per share) | $ / shares | $ 97.32 |  |  |
Warrant |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Options and warrants to purchase shares (in shares) | shares | 5,900,000 |  |  |
Strike price (in dollars per share) | $ / shares | $ 141.56 |  |  |
Convertible Senior Notes | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 0.25% |  |  |
Aggregate principal amount | $ 575,000,000.0 |  |  |
Additional principal amount subject to purchasers' option | 75,000,000.0 |  |  |
Proceeds from issuance of convertible senior notes, net of issuance costs | 559,700,000 |  |  |
Debt issuance costs incurred and capitalized | $ 15,300,000 |  |  |
Conversion ratio | 0.0102751 |  |  |
Conversion price (in dollars per share) | $ / shares | $ 97.32 |  |  |
Repurchase price as a percent of principal amount | 100.00% |  |  |
Aggregate principal amount of Notes that must be outstanding and not subject to redemption if the Company redeems less than all of the Notes | $ 150,000,000.0 |  |  |
Carrying value of debt | 461,800,000 | 467,201,000 |  |
Equity component of convertible senior notes | $ 72,700,000 | $ 72,732,000 |  |
Effective interest rate |  | 4.18% |  |
Remaining life of debt discount and issuance cost accretion |  | 4 years 8 months 12 days |  |
Maximum number of shares issuable upon conversion (in shares) | shares | 8,100,000 |  |  |
Convertible Senior Notes | Convertible Debt | Period 1 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days | day | 20 |  |  |
Threshold consecutive trading days | day | 30 |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |
Convertible Senior Notes | Convertible Debt | Period 2 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold trading days | day | 5 |  |  |
Threshold consecutive trading days | day | 10 |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |

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