Long-Term Debt - Senior Unsecured Notes Debt Exchange (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
May 22, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
Dec. 31, 2020 |
|
| Debt Instrument [Line Items] | ||||||
| Gain (loss) on extinguishment of debt | $ 143,400,000 | $ (22,156,000) | $ 143,443,000 | $ (22,156,000) | $ 143,443,000 | |
| Senior Notes | ||||||
| Debt Instrument [Line Items] | ||||||
| Debt Conversion, Original Debt, Amount | 254,200,000 | |||||
| Senior Notes | Senior Secured Note Due 2025 [Member] | ||||||
| Debt Instrument [Line Items] | ||||||
| Debt Instrument, Face Amount | $ 127,100,000 | $ 0 | $ 0 | $ 127,073,000 | ||
| Interest rate, stated percentage | 8.00% | 8.00% | 8.00% | 8.00% | ||
| Gain (loss) on extinguishment of debt | $ 22,200,000 | |||||