CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total
Beginning balance at Dec. 31, 2020	$ 28	$ 190,920	$ (2,163)	$ 621,626
Net income				81,679	$ 81,679
Common stock issued under employee stock plans	1	3,651
Repurchase of common stock	(1)	(26,373)
Stock-based compensation		17,680
Other comprehensive loss			(992)		(992)
Payment of dividends to stockholders				(15,712)
Ending balance at Jun. 30, 2021	28	185,878	(3,155)	687,593	870,344
Beginning balance at Mar. 31, 2021	29	203,051	(2,836)	653,579
Net income				41,881	41,881
Common stock issued under employee stock plans	0
Repurchase of common stock	(1)	(26,373)
Stock-based compensation		9,200
Other comprehensive loss			(319)		(319)
Payment of dividends to stockholders				(7,867)
Ending balance at Jun. 30, 2021	28	185,878	(3,155)	687,593	870,344
Beginning balance at Dec. 31, 2021	28	162,301	(3,737)	753,440	912,032
Net income				102,072	102,072
Common stock issued under employee stock plans	0	3,057
Repurchase of common stock	(4)	(178,050)		(114,295)	(292,300)
Stock-based compensation		12,692
Other comprehensive loss			(6,323)		(6,323)
Payment of dividends to stockholders				(20,936)
Ending balance at Jun. 30, 2022	24		(10,060)	720,281	710,245
Beginning balance at Mar. 31, 2022	26	39,684	(8,169)	789,032
Net income				55,824	55,824
Common stock issued under employee stock plans	0
Repurchase of common stock	(2)	(43,363)		(114,295)
Stock-based compensation		$ 3,679
Other comprehensive loss			(1,891)		(1,891)
Payment of dividends to stockholders				(10,280)
Ending balance at Jun. 30, 2022	$ 24		$ (10,060)	$ 720,281	$ 710,245