Net Income Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net income	$ 47,534	$ 39,731
Denominator:
Basic weighted average shares (in shares)	36,466	36,955
Effect of potentially dilutive shares:
Stock options (in shares)	210	471
Retired stock units (in shares)	103	292
Employee stock purchase plan (in shares)	5	5
Diluted weighted average shares (in shares)	36,784	37,723
Net income per share:
Basic (in USD per share)	$ 1.30	$ 1.08
Diluted (in USD per share)	$ 1.29	$ 1.05

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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