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Summary of Significant Accounting Policies - Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
2021 Credit Agreement | 2021 Term Loan |  |
Carrying value and estimated fair value of debt |  |
Fair Value | $ 146,250 | $ 148,125
Carrying Value | 146,250 | 148,125
2021 Credit Agreement | Revolver |  |
Carrying value and estimated fair value of debt |  |
Fair Value | 245,000 |
Carrying Value | 245,000 |
Senior Convertible Notes 2016 |  |
Carrying value and estimated fair value of debt |  |
Fair Value | 0 | 244,950
Carrying Value | $ 0 | $ 230,000

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