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Convertible Senior Notes, Net - Summary of Terms of Notes (Details) - Convertible Debt [Member] |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 05, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2014 USD ($) | Mar. 17, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  | $ 609,482,000 |  |  |
Conversion rate basis, principal amount |  | 1,000 |  |  |
2019 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  | $ 254,800,000.0 | $ 34,482,000
Coupon Rate |  |  |  | 5.50% |
Effective Rate |  |  |  | 8.31% |
Conversion Rate |  |  |  | 0.0582442 |
Remaining Period of Amortization |  |  |  | 2 months 15 days |
2022 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  | $ 345,000,000.0 |  |
Coupon Rate |  |  | 4.75% |  |
Effective Rate |  |  | 5.60% |  |
Conversion Rate |  |  | 0.0502260 |  |
Remaining Period of Amortization |  |  | 3 years 7 months 23 days |  |
2023 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount | $ 230,000,000 | $ 230,000,000.0 |  |  |
Coupon Rate | 5.375% |  |  |  |
Effective Rate | 6.16% |  |  |  |
Conversion Rate | 0.0487187 |  |  |  |
Remaining Period of Amortization | 4 years 9 months 15 days |  |  |  |

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