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, 2021	$ 28	$ 162,301	$ (3,737)	$ 753,440
Net income				148,036	$ 148,036
Common stock issued under employee stock plans		6,162
Repurchase of common stock	(4)	(178,050)		(114,295)
Stock-based compensation		15,710
Other comprehensive income (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	0	(10,060)	720,281
Net income				45,964	45,964
Common stock issued under employee stock plans		3,105
Repurchase of common stock	0	0		0
Stock-based compensation		3,018
Other comprehensive income (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
Beginning balance at Dec. 31, 2022	24	0	(7,344)	762,536	755,216
Net income				41,464	41,464
Common stock issued under employee stock plans		6,237
Repurchase of common stock	(1)	(7,833)		0	(7,800)
Stock-based compensation		21,025
Other comprehensive income (loss)			1,614		1,614
Payment of dividends to stockholders				(32,665)
Ending balance at Sep. 30, 2023	23	19,429	(5,730)	771,335	785,057
Beginning balance at Jun. 30, 2023	23	11,220	(5,757)	762,443
Net income				19,796	19,796
Common stock issued under employee stock plans		3,139
Repurchase of common stock	0	(1,835)		0	(1,800)
Stock-based compensation		6,905
Other comprehensive income (loss)			27		27
Payment of dividends to stockholders				(10,904)
Ending balance at Sep. 30, 2023	$ 23	$ 19,429	$ (5,730)	$ 771,335	$ 785,057