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Debt - Interest Expense - Convertible Senior Notes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Non-Cash Interest Expense |  |  |
Total Interest Expense | $ 19,457 | $ 222 | $ 464
Convertible Senior Notes |  |  |
Cash Interest Expense |  |  |
Coupon interest expense | 8,901 |  |
Non-Cash Interest Expense |  |  |
Amortization of debt discount | 9,490 |  |
Amortization of transaction costs | 956 |  |
Total Interest Expense | 19,347 |  |
Convertible Senior Notes | Level 2 |  |  |
Non-Cash Interest Expense |  |  |
Fair value | $ 300,700 |  |

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