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Summary of Significant Accounting Policies - Carrying Value and Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2018 Credit Agreement | 2018 Term Loan
Carrying value and estimated fair value of debt
Carrying Value		$ 126,563
Fair Value		126,563
2021 Credit Agreement | 2021 Term Loan
Carrying value and estimated fair value of debt
Carrying Value	$ 148,125
Fair Value	148,125
Senior Convertible Notes 2016
Carrying value and estimated fair value of debt
Carrying Value	230,000	230,000
Fair Value	$ 244,950	$ 244,663

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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