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Convertible Senior Notes, Net (Details) |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 09, 2017 USD ($) | Aug. 21, 2017 USD ($) | Aug. 18, 2014 USD ($) | Mar. 17, 2014 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 29, 2018 $ / shares | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Convertible senior notes, net |  |  |  |  | $ 585,972,000 |  |  | $ 584,897,000
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 17.98 |
Convertible Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 599,750,000 |  |  |  |  |
Conversion rate basis, principal amount |  |  |  |  | 1,000,000 |  |  |
Convertible Debt [Member] | March 2019 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 143,800,000.0 |  |  |  |
Coupon rate |  |  |  | 5.50% |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  | $ 139,000,000 |  |  |  |
Convertible senior notes, net |  |  |  |  | 142,700,000 |  |  |
Unamortized discount |  |  |  |  | 1,100,000 |  |  |
Convertible Debt [Member] | August 2019 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 111,000,000.0 |  |  |  |  |
Coupon rate |  |  | 5.50% |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  | $ 109,600,000 |  |  |  |  |
Convertible senior notes, net |  |  |  |  | 109,700,000 |  |  |
Unamortized discount |  |  |  |  | 1,300,000 |  |  |
Convertible Debt [Member] | August 2022 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 230,000,000 |  |  |  |  |  |
Coupon rate |  | 4.75% |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  | $ 224,800,000 |  |  |  |  |  |
Convertible senior notes, net |  |  |  |  | 221,300,000 |  |  |
Unamortized discount |  |  |  |  | 8,700,000 |  |  |
Convertible Debt [Member] | November 2022 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount | $ 115,000,000 |  |  |  |  |  |  |
Coupon rate | 4.75% |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes | $ 112,700,000 |  |  |  |  |  |  |
Convertible senior notes, net |  |  |  |  | 112,200,000 |  |  |
Unamortized discount |  |  |  |  | 2,800,000 |  |  |
Convertible Debt [Member] | 2019 and 2022 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Equity component of senior notes |  |  |  |  | 22,400,000 |  |  |
Convertible Debt [Member] | 2019 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 254,750,000 |  |  |  |
Coupon rate |  |  |  | 5.50% |  |  |  |
Effective rate |  |  |  | 6.36% |  |  |  |
Conversion rate |  |  |  | 57.6745 |  |  |  |
Remaining period of amortization (years) |  |  |  | 11 months 13 days |  |  |  |
Equity component of senior notes |  |  |  |  | 11,400,000 |  |  |
Interest expense on debt |  |  |  |  | 7,600,000 | $ 3,500,000 |  |
Additional non-cash interest expense |  |  |  |  | 1,800,000 | $ 900,000 |  |
Convertible Debt [Member] | 2022 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 345,000,000 |  |  |  |  |
Coupon rate |  |  | 4.75% |  |  |  |  |
Effective rate |  |  | 5.61% |  |  |  |  |
Conversion rate |  |  | 50.2260 |  |  |  |  |
Remaining period of amortization (years) |  |  | 4 years 4 months 24 days |  |  |  |  |
Equity component of senior notes |  |  |  |  | $ 11,000,000 |  |  |

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