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DEBT - Convertible Senior Notes - Liability and Equity Components (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Liability component |  |
Principal | $ 677,234 | $ 728,173
Debt discount and issuance costs, net | (77,872) | (12,080)
Convertible senior notes |  |
Liability component |  |
Principal | 192,500 | $ 0
Convertible senior notes | 2025 Notes |  |
Liability component |  |
Principal | 192,500 |
Debt discount and issuance costs, net | (68,342) |
Net carrying amount | 124,158 |
Equity component, net | $ 65,361 |

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