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Convertible Senior Notes, Net - Summary of Note Terms (Details) - Convertible Debt [Member] |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 05, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |
Principal Amount |  | $ 575,000,000 |
Conversion rate basis, principal amount |  | $ 1,000 |
2022 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount |  |  | $ 345,000,000
Coupon Rate |  |  | 4.75%
Effective Rate |  |  | 5.60%
Conversion Rate |  | 0.0502260 |
Remaining Period of Amortization |  |  | 3 years 4 months 24 days
2023 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Amount | $ 230,000,000 |  |
Coupon Rate | 5.375% |  |
Effective Rate | 6.16% |  |
Conversion Rate |  | 0.0487187 |
Remaining Period of Amortization | 4 years 6 months 18 days |  |

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