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Stock-Based Compensation Plans - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | $ 3,041 | $ 4,536 | $ 7,670 | $ 7,298
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | 14 | 72 | 36 | 150
2007 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | 0 | 957 | 0 | 1,642
2021 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Total Stock Compensation Expense | $ 3,027 | $ 3,507 | $ 7,634 | $ 5,506

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