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Summary of Significant Accounting Policies - Reconciliation of shares used to determine net income per share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Summary of Significant Accounting Policies
Net income	$ 7,806	$ 13,582	$ 26,953	$ 48,302
Weighted average number of shares - basic	45,435,458	45,404,963	45,486,263	45,348,072
Shares underlying options	1,699,985	1,940,417	1,792,375	1,971,392
Weighted average number of shares - diluted	47,135,443	47,345,380	47,278,638	47,319,464

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