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Stock-Based Compensation Plans - Stock compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-based compensation plans |  |  |  |
Stock compensation expense | $ 4,536 | $ 3,015 | $ 7,298 | $ 5,132
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | 72 | 75 | 150 | 107
2007 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | 957 | 703 | 1,642 | 1,728
2018 Stock Incentive Plan |  |  |  |
Stock-based compensation plans |  |  |  |
Stock compensation expense | $ 3,507 | $ 2,237 | $ 5,506 | $ 3,297

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