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Debt - Narrative (Details) - 6.25% senior convertible notes due 2022 - Convertible Notes | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Jan. 23, 2017
Debt Instrument [Line Items] |  |  |
Face amount | $ 138,000,000.0 |  |
Interest rate | 6.25% |  | 6.25%
Discount and deferred charges, net | $ 2,700,000 | $ 5,000,000.0 |
Cost of debt, percentage | 8.24% |  |
Effective interest rate | 96.00% |  |
Convertible note, conversion ratio | 0.1427144 |  |
Conversion price (in dollars per share) | $ / shares | $ 7.01 |  |

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