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Recent Accounting Pronouncements - (Details) - USD ($) | Jan. 01, 2021 | Sep. 30, 2021 | Mar. 19, 2021 | Dec. 31, 2020 | Jan. 30, 2018
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1.5% Convertible Unsecured Senior Notes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stated interest rate |  | 1.50% |  |  |
Effective interest rate percentage |  |  |  |  | 6.00%
Debt instrument, face amount |  |  |  |  | $ 200,000,000
4.75% Convertible Senior Notes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Stated interest rate |  | 4.75% | 4.75% |  |
Debt instrument, face amount |  |  | $ 135,000,000 |  |
Convertible Debt | 1.5% Convertible Unsecured Senior Notes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Effective interest rate percentage | 2.00% |  |  | 6.00% |
Convertible Debt | 1.5% Convertible Unsecured Senior Notes | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Debt instrument, increase net | $ 12,200,000 |  |  |  |
Decrease in deferred income taxes | 2,700,000 |  |  |  |
Net decrease, stockholder's equity | $ 9,500,000 |  |  |  |

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