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v3.10.0.1

Convertible Senior Notes, Net (Details) |  |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2018 USD ($) shares | Aug. 18, 2014 USD ($) | Mar. 17, 2014 USD ($) | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) offering | Dec. 31, 2014 USD ($) offering
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  | $ 0 | $ 227,700,000 |  |
Cash payment for debt redemption |  |  |  |  |  |  | 40,461,000 | 0 |  |
Loss on early extinguishment of debt |  |  |  |  | $ 2,573,000 | $ 0 | 2,573,000 | 0 |  |
Convertible senior notes, net |  |  |  | $ 370,174,000 | $ 370,174,000 |  | $ 370,174,000 |  | $ 584,897,000 |
Share price (in dollars per share) | $ / shares |  |  |  | $ 18.87 | $ 18.87 |  | $ 18.87 |  |  |
Exchange of convertible senior notes for common stock |  |  |  |  |  |  | $ 178,566,000 |  |  |
2019 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  | $ 2,600,000 | 0 | 2,600,000 | 0 |  |
Convertible Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 380,932,000 | 380,932,000 |  | 380,932,000 |  |  |
Conversion rate basis, principal amount |  |  |  |  |  |  | 1,000 |  |  |
Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  |  | 2
Principal amount |  |  | $ 35,932,000 |  |  |  |  |  |  | $ 254,800,000.0
Coupon rate |  |  | 5.50% |  |  |  |  |  |  | 5.50%
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  |  | $ 248,600,000
Principal amount redeemed | $ 206,200,000 |  |  | 12,600,000 | 218,800,000 |  |  |  |  |
Cash payment for debt redemption | $ 39,300,000 |  |  | 200,000 |  |  |  |  |  |
Convertible senior notes, net |  |  |  | 35,500,000 | 35,500,000 |  | 35,500,000 |  |  |
Unamortized discount |  |  |  | 500,000 | 500,000 |  | 500,000 |  |  |
Effective rate |  |  | 6.50% |  |  |  |  |  |  |
Conversion rate |  |  | 0.0580421 |  |  |  |  |  |  |
Remaining period of amortization (years) |  |  | 5 months 12 days |  |  |  |  |  |  |
Interest expense on debt |  |  |  |  | 5,500,000 | 4,700,000 | 20,700,000 | 11,700,000 |  |
Additional non-cash interest expense |  |  |  |  | 1,200,000 | $ 1,200,000 | 4,900,000 | $ 3,000,000 |  |
Convertible Debt [Member] | 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of debt offerings issued | offering |  |  |  |  |  |  |  |  | 2 |
Principal amount |  | $ 345,000,000 |  |  |  |  |  |  | $ 345,000,000.0 |
Coupon rate |  | 4.75% |  |  |  |  |  |  | 4.75% |
Proceeds from issuance of convertible senior notes |  |  |  |  |  |  |  |  | $ 337,500,000 |
Convertible senior notes, net |  |  |  | 334,700,000 | 334,700,000 |  | 334,700,000 |  |  |
Unamortized discount |  |  |  | $ 10,300,000 | $ 10,300,000 |  | $ 10,300,000 |  |  |
Effective rate |  | 5.61% |  |  |  |  |  |  |  |
Conversion rate |  | 0.0502260 |  |  |  |  |  |  |  |
Remaining period of amortization (years) |  | 3 years 10 months 24 days |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock (in shares) | shares |  |  |  |  |  |  | 10,744,577 |  |  |
Exchange of convertible senior notes for common stock |  |  |  |  |  |  | $ 107,000 |  |  |
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 |  |  | 724,250 | 10,744,577 |  |  |  |  |
Additional Paid In Capital [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock |  |  |  |  |  |  | 178,459,000 |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2019 and 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock |  |  |  |  |  |  | 22,400,000 |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock | $ 166,000,000 |  |  | $ 12,400,000 |  |  | 11,400,000 |  |  |
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2022 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange of convertible senior notes for common stock |  |  |  |  |  |  | $ 11,000,000 |  |  |

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