Summary of Significant Accounting Policies - Reconciliation of shares used to determine net income per share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Summary of Significant Accounting Policies
Net income	$ 9,562	$ 15,531
Weighted average number of shares - basic	45,509,423	45,298,514
Shares underlying options	1,959,097	2,012,513
Weighted average number of shares outstanding - diluted	47,468,520	47,311,027