CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018	$ 1,048,231	$ 702	$ 632,235	$ 863,768	$ (355,857)	$ (92,617)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,062			67,062
Other comprehensive income (loss)	1,034					1,034
Stock-based compensation	36,763		36,763
Shares issued and forfeited, net, under stock plans	16,481		(1,340)		17,821
Repurchase of common stock	(35,617)				(35,617)
Repurchase of stock-based compensation awards for tax withholdings	(3,986)				(3,986)
Ending balance at Dec. 31, 2019	1,129,968	702	667,658	930,830	(377,639)	(91,583)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	72,660			72,660
Other comprehensive income (loss)	(862)					(862)
Stock-based compensation	29,602		29,602
Shares issued and forfeited, net, under stock plans	15,678		(14,829)		30,507
Repurchase of common stock	(28,881)				(28,881)
Repurchase of stock-based compensation awards for tax withholdings	(11,568)				(11,568)
Ending balance at Dec. 31, 2020	1,206,597	702	682,431	1,003,490	(387,581)	(92,445)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	127,791			127,791
Other comprehensive income (loss)	(7,102)					(7,102)
Stock-based compensation	27,242		27,242
Shares issued and forfeited, net, under stock plans	12,460		(21,360)		33,820
Repurchase of common stock	(107,378)				(107,378)
Repurchase of stock-based compensation awards for tax withholdings	(14,833)				(14,833)
Ending balance at Dec. 31, 2021	$ 1,244,777	$ 702	$ 688,313	$ 1,131,281	$ (475,972)	$ (99,547)