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Fair Value of Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Amounts owed to employees participating in the deferred compensation plan | $ 2,600,000 | $ 2,800,000
Liability fair value | 0 | $ 0
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes due 2024 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of debt | 32,000,000.0 |
Fair Value, Inputs, Level 2 | Convertible Notes | Convertible Senior Notes Due 2026 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of debt | $ 206,000,000.0 |

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