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Long-Term Debt - Convertible Senior Notes Due 2023 (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 14, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Gain (loss) on extinguishment of long-term debt |  | $ 9,239 | $ (18) | $ (1,183)
Unamortized debt discount |  | (45,692) | (22,540) |
Interest expense |  | $ 30,538 | 31,186 | 32,617
Convertible Senior Notes Maturing September 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as a percent) |  | 4.125% |  |
Frequency of periodic payment |  | semi-annually |  |
Maturity date |  | Sep. 15, 2023 |  |
Initial conversion ratio |  | 0.1056133 |  |
Initial conversion price per share (in dollars per share) | $ / shares |  | $ 9.47 |  |
Redemption price as a percentage of principal amount |  | 100.00% |  |
Minimum percentage in aggregate principal amount |  | 25.00% |  |
Repurchased principal amount | $ 95,000 |  |  |
Repurchase amount | 94,100 |  |  |
Reacquisition of debt component | 78,200 |  |  |
Gain (loss) on extinguishment of long-term debt | 5,900 |  |  |
Unamortized debt discount |  | $ (2,651) | (14,500) |
Reacquisition of equity component | $ 15,900 |  |  |
Carrying amount of equity component |  | 4,200 | 20,100 |
Carrying amount of equity component, net of tax |  | $ 3,600 | 15,900 |
Effective interest rate (as a percent) |  | 7.80% |  |
Interest expense |  | $ 6,100 | $ 8,400 | $ 6,400

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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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