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Debt - Narrative (Details) - 6.25% senior convertible notes due 2022 - Convertible Notes | Jan. 23, 2017 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Debt Instrument [Line Items] |  |  |
Face amount | $ 138,000,000.0 |  |
Interest rate | 6.25% |  |
Discount and deferred charges, net |  | $ 2,000,000.0 | $ 2,700,000
Debt issuance cost, percentage | 8.24% |  |
Notes issued, percentage of principle | 96.00% |  |
Conversion ratio | 0.1427144 |  |
Conversion price (in dollars per share) | $ / shares | $ 7.01 |  |

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