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, 2020	805,779	355	(5,578)	695,904	115,229	(131)
Net income	83,240
Foreign currency translation	(1,629)
Balance at Jun. 30, 2021	851,882	358	(5,578)	716,547	142,315	(1,760)
Balance at Mar. 31, 2021	858,927	359	(5,578)	707,877	158,535	(2,266)
Net income	39,934				39,934
Foreign currency translation	506					506
Stock-based compensation expense	3,570			3,570
Stock options exercised	5,102	2		5,100
Repurchases of common stock	(56,157)	(3)			(56,154)
Balance at Jun. 30, 2021	851,882	358	(5,578)	716,547	142,315	(1,760)
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)
Balance at Dec. 31, 2021	952,928	360	(5,427)	727,857	234,984	(4,846)
Net income	110,671
Foreign currency translation	(5,126)
Balance at Jun. 30, 2022	283,252	309	(14,243)	753,300	(446,142)	(9,972)
Balance at Mar. 31, 2022	605,016	336	(14,243)	746,123	(120,812)	(6,388)
Net income	49,360				49,360
Foreign currency translation	(3,584)					(3,584)
Stock-based compensation expense	5,653			5,653
Stock options exercised	1,524			1,524
Repurchases of common stock	(374,717)	(27)			(374,690)
Balance at Jun. 30, 2022	$ 283,252	$ 309	$ (14,243)	$ 753,300	$ (446,142)	$ (9,972)