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Convertible Senior Notes, Net (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) offering
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of senior secured notes |  | $ 500,000,000 | $ 0 | $ 0 |
Conversions of convertible senior notes for common stock |  |  |  | 33,778,000 |
Common Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 13.16 |  |  |
Conversions of convertible senior notes for common stock |  |  |  | 20,000 |
Additional Paid-In-Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversions of convertible senior notes for common stock |  |  |  | 33,758,000 |
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount |  | $ 575,000,000 | 575,000,000 |  |
Interest expense |  | 28,800,000 | 28,800,000 | 29,100,000 |
Non-cash interest expense |  | 6,300,000 | 6,000,000 | $ 6,000,000 |
Convertible Debt | 2022 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  | 2
Debt instrument, face amount |  | $ 345,000,000 | $ 345,000,000 |  | $ 345,000,000
Stated interest rate |  | 4.75% | 4.75% |  | 4.75%
Proceeds from issuance of senior secured notes |  |  |  |  | $ 337,500,000
Convertible senior notes, net |  | $ 343,100,000 |  |  |
Unamortized discount |  | 1,900,000 |  |  |
Convertible Debt | 2022 Notes | Additional Paid-In-Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversions of convertible senior notes for common stock |  | 11,000,000 |  |  |
Convertible Debt | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 230,000,000 | $ 230,000,000 | $ 230,000,000 |  |
Stated interest rate | 5.375% | 5.38% | 5.38% |  |
Proceeds from issuance of senior secured notes | $ 223,700,000 |  |  |  |
Convertible senior notes, net |  | $ 226,900,000 |  |  |
Unamortized discount |  | 3,100,000 |  |  |
Convertible Debt | 2023 Notes | Additional Paid-In-Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversions of convertible senior notes for common stock |  | 4,400,000 |  |  |
Convertible Debt | 2022 and 2023 Notes | Additional Paid-In-Capital |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Conversions of convertible senior notes for common stock |  | $ 15,400,000 |  |  |

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