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				123,713	$ 123,713
Common stock issued under employee stock plans	1	7,709
Repurchase of common stock	(1)	(36,164)
Stock-based compensation		27,325
Other comprehensive loss			(1,086)		(1,086)
Payment of dividends to stockholders				(23,552)
Ending balance at Sep. 30, 2021	28	189,790	(3,249)	721,787	908,356
Beginning balance at Jun. 30, 2021	28	185,878	(3,155)	687,593
Net income				42,034	42,034
Common stock issued under employee stock plans	0	4,058
Repurchase of common stock	0	(9,791)
Stock-based compensation		9,645
Other comprehensive loss			(94)		(94)
Payment of dividends to stockholders				(7,840)
Ending balance at Sep. 30, 2021	28	189,790	(3,249)	721,787	908,356
Beginning balance at Dec. 31, 2021	28	162,301	(3,737)	753,440	912,032
Net income				148,036	148,036
Common stock issued under employee stock plans	0	6,162
Repurchase of common stock	(4)	(178,050)		(114,295)	(292,300)
Stock-based compensation		15,710
Other comprehensive loss			(8,080)		(8,080)
Payment of dividends to stockholders				(31,229)
Ending balance at Sep. 30, 2022	24	6,123	(11,817)	755,952	750,282
Beginning balance at Jun. 30, 2022	24		(10,060)	720,281
Net income				45,964	45,964
Common stock issued under employee stock plans	0	3,105
Repurchase of common stock	0	0
Stock-based compensation		3,018
Other comprehensive loss			(1,757)		(1,757)
Payment of dividends to stockholders				(10,293)
Ending balance at Sep. 30, 2022	$ 24	$ 6,123	$ (11,817)	$ 755,952	$ 750,282