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Stock-Based Compensation Plans - Stock compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock-based compensation plans |  |
Stock compensation expense | $ 2,762 | $ 2,117
Employee Stock Purchase Plan |  |
Stock-based compensation plans |  |
Stock compensation expense | 78 | 32
2007 Stock Incentive Plan |  |
Stock-based compensation plans |  |
Stock compensation expense | 685 | 1,025
2018 Stock Incentive Plan |  |
Stock-based compensation plans |  |
Stock compensation expense | $ 1,999 | $ 1,060

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