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Debt - 5.00% Convertible Senior Notes Due 2021 (Details) - 5.00% Convertible Senior Notes due 2021 - USD ($) shares in Millions | 8 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2022 | Jun. 15, 2021 | Jun. 30, 2018 | Jun. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  | 5.00%
Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 115,000,000
Debt instrument, interest rate |  |  | 5.00% |  | 5.00% |
Repurchase face amount | $ 66,300,000 | $ 66,300,000 |  | $ 48,700,000 |  |
Repayments of convertible debt | $ 18,600,000 |  |  |  |  |
Issuance of common stock for convertible notes repurchase, net (in shares) | 3.2 |  |  |  |  |
Repurchase of convertible debt | $ 74,300,000 |  |  |  |  |
Loss debt extinguishment and commitment costs |  | $ 6,100,000 |  |  |  |
Convertible Debt | Whitebox Advisors, LLC | Affiliated Entity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | 47,500,000
Convertible Debt | Highbridge | Affiliated Entity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 40,400,000

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