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Convertible Senior Notes, Net (Details) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 09, 2017 USD ($) | Aug. 21, 2017 USD ($) | Aug. 18, 2014 USD ($) | Mar. 17, 2014 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 29, 2017 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  |  | $ 343,275,000 | $ 0 | $ 0 |
Convertible senior notes, net |  |  |  |  | 584,897,000 | 249,994,000 |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 18.45
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 |  |  |  | $ 143,750,000 |  |  |  |
Coupon rate |  |  |  | 5.50% |  |  |  |
Proceeds from issuance of convertible senior notes |  |  |  | $ 139,037,000 |  |  |  |
Convertible senior notes, net |  |  |  |  | 142,498,000 |  |  |
Unamortized discount |  |  |  |  | 1,252,000 |  |  |
Convertible Debt [Member] | August 2019 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  | $ 111,000,000 |  |  |  |  |
Coupon rate |  |  | 5.50% |  |  |  |  |
Proceeds from issuance of convertible senior notes |  |  | $ 109,615,000 |  |  |  |  |
Convertible senior notes, net |  |  |  |  | 109,436,000 |  |  |
Unamortized discount |  |  |  |  | 1,564,000 |  |  |
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 |  | $ 224,825,000 |  |  |  |  |  |
Convertible senior notes, net |  |  |  |  | 220,897,000 |  |  |
Unamortized discount |  |  |  |  | 9,103,000 |  |  |
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 | $ 112,686,000 |  |  |  |  |  |  |
Convertible senior notes, net |  |  |  |  | 112,065,000 |  |  |
Unamortized discount |  |  |  |  | 2,935,000 |  |  |
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 |  |  | 50.23 |  |  |  |  |
Remaining period of amortization (years) |  |  | 4 years 7 months 24 days |  |  |  |  |
Equity component of senior notes |  |  |  |  | 11,002,000 |  |  |
Convertible Debt [Member] | 2019 and 2022 Notes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Equity component of senior notes |  |  |  |  | 22,447,000 |  |  |
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 |  |  |  | 57.49 |  |  |  |
Remaining period of amortization (years) |  |  |  | 1 year 2 months 13 days |  |  |  |
Equity component of senior notes |  |  |  |  | 11,445,000 |  |  |
Interest expense on debt |  |  |  |  | 18,726,000 | 14,011,000 | 14,011,000 |
Additional non-cash interest expense |  |  |  |  | $ 4,724,000 | $ 3,557,000 | $ 3,440,000 |

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