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Convertible Senior Notes, Net - Additional Information (Details) |  | 3 Months Ended | 5 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 02, 2018 USD ($) shares | Dec. 31, 2018 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) offering | Dec. 31, 2016 USD ($) | Dec. 31, 2014 USD ($) offering | Oct. 05, 2018 USD ($) | Mar. 17, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  | $ 226,550,000 | $ 343,275,000 | $ 0 |  |  |
Cash payment for debt redemption |  |  |  |  |  |  |  |  |  |  | 40,461,000 | 0 | 0 |  |  |
Loss on early extinguishment of debt |  | $ 0 | $ 2,573,000 | $ 0 | $ 0 | $ 1,947,000 | $ 0 | $ 0 | $ 0 |  | 2,573,000 | 1,947,000 | 0 |  |  |
Convertible senior notes, net |  | $ 592,000,000 |  |  |  | 584,897,000 |  |  |  | $ 592,000,000 | $ 592,000,000 | 584,897,000 |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 16.66 |  |  |  |  |  |  |  | $ 16.66 | $ 16.66 |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  | $ 180,016,000 |  |  |  |  |
2019 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  | $ 609,482,000 |  |  |  |  |  |  |  | $ 609,482,000 | 609,482,000 |  |  |  |  |
Interest expense on debt |  |  |  |  |  |  |  |  |  |  | 28,200,000 | 18,700,000 | 14,000,000 |  |  |
Additional non-cash interest expense |  |  |  |  |  |  |  |  |  |  | 7,100,000 | $ 4,700,000 | $ 3,500,000 |  |  |
Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 254,800,000.0 |  | $ 34,482,000
Coupon Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 248,600,000 |  |
Principal amount redeemed | $ 206,200,000 |  |  |  |  |  |  |  |  | 14,100,000 | 220,300,000 |  |  |  |  |
Cash payment for debt redemption | $ 39,300,000 |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |
Convertible senior notes, net |  | 34,300,000 |  |  |  |  |  |  |  | 34,300,000 | 34,300,000 |  |  |  |  |
Unamortized discount |  | 200,000 |  |  |  |  |  |  |  | 200,000 | 200,000 |  |  |  |  |
Convertible Debt [Member] | 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Principal Amount |  |  |  |  |  | $ 345,000,000.0 |  |  |  |  |  | $ 345,000,000.0 |  |  |  |
Coupon Rate |  |  |  |  |  | 4.75% |  |  |  |  |  | 4.75% |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 337,500,000 |  |  |  |
Convertible senior notes, net |  | 335,300,000 |  |  |  |  |  |  |  | 335,300,000 | 335,300,000 |  |  |  |  |
Unamortized discount |  | 9,700,000 |  |  |  |  |  |  |  | 9,700,000 | 9,700,000 |  |  |  |  |
Convertible Debt [Member] | 2023 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  | 230,000,000.0 |  |  |  |  |  |  |  | 230,000,000.0 | 230,000,000.0 |  |  |  | $ 230,000,000 |
Coupon Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.375% |
Proceeds from issuance of convertible senior notes |  | 223,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, net |  | 222,400,000 |  |  |  |  |  |  |  | 222,400,000 | 222,400,000 |  |  |  |  |
Unamortized discount |  | 7,600,000 |  |  |  |  |  |  |  | $ 7,600,000 | $ 7,600,000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 10,828,475 |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  | $ 108,000 |  |  |  |  |
Common Stock [Member] | Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock (in shares) | shares | 10,020,328 |  |  |  |  |  |  |  |  | 808,148 |  |  |  |  |  |
Additional Paid In Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  | 179,908,000 |  |  |  |  |
Fair value of debt component of exchanged and converted Notes |  | $ 27,200,000 |  |  |  |  |  |  |  | $ 27,200,000 | 27,200,000 |  |  |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2019 and 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  | 26,800,000 |  |  |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock | $ 166,000,000 |  |  |  |  |  |  |  |  | $ 13,900,000 | 11,400,000 |  |  |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |  |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2023 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of Notes for common stock |  |  |  |  |  |  |  |  |  |  | $ 4,400,000 |  |  |  |  |

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