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Stock-Based Compensation Plans - Stock compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock-based compensation plans
Stock compensation expense	$ 4,577	$ 3,113	$ 11,875	$ 8,245
Employee Stock Purchase Plan
Stock-based compensation plans
Stock compensation expense	51	77	201	184
2007 Stock Incentive Plan
Stock-based compensation plans
Stock compensation expense	9	707	1,651	2,435
2018 Stock Incentive Plan
Stock-based compensation plans
Stock compensation expense	$ 4,517	$ 2,329	$ 10,023	$ 5,626

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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+ References

No definition available.

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