v3.19.3

INDEBTEDNESS - Net Carrying Amount of Convertible Notes (Details) - Convertible Debt - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | May 25, 2018 | Mar. 06, 2017
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Principal outstanding | $ 1,074,226 | $ 1,074,228 |  |
Unamortized debt discount | (139,332) | (166,493) |  |
Unamortized debt issuance costs | (6,025) | (8,040) |  |
Net carrying value | 928,869 | 899,695 |  |
2023 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal outstanding | 862,500 | 862,500 |  |
Unamortized debt discount | (117,932) | (138,924) |  |
Unamortized debt issuance costs | (3,647) | (5,054) | $ (5,600) |
Net carrying value | 740,921 | 718,522 |  |
2022 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal outstanding | 211,726 | 211,728 |  |
Unamortized debt discount | (21,400) | (27,569) |  |
Unamortized debt issuance costs | (2,378) | (2,986) |  | $ (9,400)
Net carrying value | $ 187,948 | $ 181,173 |  |

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