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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 25, 2020 | Mar. 10, 2020 | Jan. 28, 2020 | May 01, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Private placement, loss recorded in additional paid-in-capital |  |  |  |  |  | $ 444 | $ 444 |  |
Purchase of treasury stock (in shares) |  | 800,000 | 1,000,000.0 | 24,000,000.0 | 800,000 |  |  |  |
Purchase of treasury stock |  | $ 9,200 | $ 12,600 | $ 438,000 | $ 8,800 |  | $ 30,626 | $ 437,962 |
Payments for stock options exercised |  |  |  | $ 33,900 |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  | 10,500,000 | 10,500,000 |  | 10,500,000
Number of shares of common stock to be issued for upon exercise of warrants (in shares) |  |  |  |  |  | 5,800,000 | 5,800,000 | 5,800,000 |
Warrant, exercise price (in usd per share) |  |  |  |  |  | $ 24.39 | $ 24.39 | $ 24.39 |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Private placement, loss recorded in additional paid-in-capital | $ (800) |  |  |  |  | $ (813) | $ (813) |  |
Private Placement |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 68,857 |  |  |  |  |  |  |  |
Price per share (in usd per share) | $ 10.17 |  |  |  |  |  |  |  |
Total value raised, net of expenses | $ 400 |  |  |  |  |  |  |  |
Affiliated Entity |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options settled in period (in shares) |  |  |  | 2,300,000 |  |  |  |  |
Affiliated Entity | Mudrick Capital Management |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  | 11,100,000 |  |  |  |  |
Purchase of treasury stock |  |  |  | $ 202,600 |  |  |  |  |
Affiliated Entity | Paulson and Co |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  | 5,600,000 |  |  |  |  |
Purchase of treasury stock |  |  |  | $ 102,200 |  |  |  |  |
Affiliated Entity | GoldenTree Asset Management |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Purchase of treasury stock (in shares) |  |  |  | 4,200,000 |  |  |  |  |
Purchase of treasury stock |  |  |  | $ 75,800 |  |  |  |  |

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