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Debt - Convertible Senior Notes - Liability and Equity Components (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Liability component |  |
Outstanding principal balance | $ 447,234 | $ 447,234
Debt discount and issuance costs, net | (60,559) | (64,379)
Convertible senior notes | 2025 Notes |  |
Liability component |  |
Outstanding principal balance | 192,500 | 192,500
Debt discount and issuance costs, net | (58,261) | (61,766)
Net carrying amount | 134,239 | 130,734
Equity component, net | $ 65,361 | $ 65,361

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