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Stock-Based Compensation Plans - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | $ 3,146 | $ 4,577 | $ 10,816 | $ 11,875
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | 48 | 51 | 84 | 201
2007 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | 0 | 9 | 0 | 1,651
2021 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | $ 3,098 | $ 4,517 | $ 10,732 | $ 10,023

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