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Long-Term Debt - Convertible Senior Notes Due 2022 (Details) $ / shares in Units, $ in Thousands | Nov. 01, 2016 USD ($) $ / shares | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 489,025 |
Unamortized debt discount |  | 30,300 |
Convertible Senior Notes Maturing May 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 125,000 | 125,000 | $ 125,000
Interest rate (as a percent) | 4.25% |  |
Frequency of periodic payment | semi-annually |  |
Maturity date | May 01, 2022 |  |
Initial conversion ratio | 0.0719748 |  |
Initial conversion price per share (in dollars per share) | $ / shares | $ 13.89 |  |
Redemption price as a percentage of principal amount | 100.00% |  |
Minimum percentage in aggregate principal amount | 25.00% |  |
Unamortized debt discount | $ 16,900 | $ 11,772 | $ 13,900
Carrying amount of equity component | $ 11,000 |  |
Effective interest rate (as a percent) | 7.30% |  |

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- Definition Minimum percentage in aggregate principal amount then outstanding holders of the notes are required to have in order to declare the entire principal amount of all the notes, and the interest accrued on such notes, if any, to be immediately due and payable pursuant to customary terms and covenants, including that upon certain events of default occurring and continuing. + References No definition available. + Details
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