CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2020	$ 805,779	$ 355	$ (5,578)	$ 695,904	$ 115,229	$ (131)
Net income	43,306				43,306
Foreign currency translation	(2,135)					(2,135)
Stock-based compensation expense	2,871			2,871
Stock options exercised	9,106	4		9,102
Balance at Mar. 31, 2021	858,927	359	(5,578)	707,877	158,535	(2,266)
Balance at Dec. 31, 2021	952,928	360	(5,427)	727,857	234,984	(4,846)
Net income	61,311				61,311
Foreign currency translation	(1,542)					(1,542)
Stock-based compensation expense	4,372			4,372
Stock options exercised	13,897	3		13,894
Repurchases of common stock	(425,950)	27	14,243		411,680
Retirement of treasury stock			(5,427)		5,427
Balance at Mar. 31, 2022	$ 605,016	$ 336	$ (14,243)	$ 746,123	$ (120,812)	$ (6,388)