Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)	Total
Balance at Dec. 31, 2023	$ 33	$ 547,189	$ 319,506	$ (1,846)	$ 864,882
Balance (in shares) at Dec. 31, 2023	32,685
Increase (Decrease) in Stockholders' Equity
Net income			51,595		51,595
Foreign currency translation adjustments				(1,731)	(1,731)
Change in pension obligation				5	5
Issuance of common stock on restricted stock units, net of shares withheld		(2,699)			(2,699)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	42
Stock-based compensation expense		4,690			4,690
Repurchase of common stock		(2,201)	(12,798)		(14,999)
Repurchase of common stock (in shares)	(122)
Balance at Mar. 31, 2024	$ 33	546,979	358,303	(3,572)	901,743
Balance (in shares) at Mar. 31, 2024	32,605
Balance at Dec. 31, 2023	$ 33	547,189	319,506	(1,846)	864,882
Balance (in shares) at Dec. 31, 2023	32,685
Increase (Decrease) in Stockholders' Equity
Net income					151,036
Foreign currency translation adjustments					(387)
Change in pension obligation					15
Balance at Sep. 30, 2024	$ 33	545,350	432,429	(2,218)	975,594
Balance (in shares) at Sep. 30, 2024	32,504
Balance at Mar. 31, 2024	$ 33	546,979	358,303	(3,572)	901,743
Balance (in shares) at Mar. 31, 2024	32,605
Increase (Decrease) in Stockholders' Equity
Net income			50,866		50,866
Foreign currency translation adjustments				(913)	(913)
Change in pension obligation				5	5
Issuance of stock under Employee Stock Purchase Plan		1,242			1,242
Issuance of stock under Employee Stock Purchase Plan (in shares)	10
Issuance of common stock on restricted stock units, net of shares withheld		(8,468)			(8,468)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	143
Stock-based compensation expense		5,469			5,469
Repurchase of common stock		(2,545)	(12,451)		(14,996)
Repurchase of common stock (in shares)	(141)
Balance at Jun. 30, 2024	$ 33	542,677	396,718	(4,480)	934,948
Balance (in shares) at Jun. 30, 2024	32,617
Increase (Decrease) in Stockholders' Equity
Net income			48,576		48,576
Foreign currency translation adjustments				2,257	2,257
Change in pension obligation				5	5
Issuance of common stock on restricted stock units, net of shares withheld		(241)			(241)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	5
Stock-based compensation expense		5,412			5,412
Repurchase of common stock		(2,498)	(12,865)		(15,363)
Repurchase of common stock (in shares)	(118)
Balance at Sep. 30, 2024	$ 33	545,350	432,429	(2,218)	975,594
Balance (in shares) at Sep. 30, 2024	32,504
Balance at Dec. 31, 2024	$ 32	548,654	470,318	(6,214)	1,012,790
Balance (in shares) at Dec. 31, 2024	32,365
Increase (Decrease) in Stockholders' Equity
Net income			28,579		28,579
Foreign currency translation adjustments				646	646
Unrealized gains (losses) on available-for-sale investments				81	81
Issuance of common stock on restricted stock units, net of shares withheld		(1,583)			(1,583)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	38
Stock-based compensation expense		4,903			4,903
Repurchase of common stock		(4,954)	(13,224)		(18,178)
Repurchase of common stock (in shares)	(274)
Balance at Mar. 31, 2025	$ 32	547,020	485,673	(5,487)	1,027,238
Balance (in shares) at Mar. 31, 2025	32,129
Balance at Dec. 31, 2024	$ 32	548,654	470,318	(6,214)	1,012,790
Balance (in shares) at Dec. 31, 2024	32,365
Increase (Decrease) in Stockholders' Equity
Net income					85,941
Foreign currency translation adjustments					4,304
Unrealized gains (losses) on available-for-sale investments					301
Balance at Sep. 30, 2025	$ 31	532,951	488,771	(1,609)	1,020,144
Balance (in shares) at Sep. 30, 2025	30,998
Balance at Mar. 31, 2025	$ 32	547,020	485,673	(5,487)	1,027,238
Balance (in shares) at Mar. 31, 2025	32,129
Increase (Decrease) in Stockholders' Equity
Net income			31,376		31,376
Foreign currency translation adjustments				5,066	5,066
Unrealized gains (losses) on available-for-sale investments				(58)	(58)
Issuance of stock under Employee Stock Purchase Plan		1,246			1,246
Issuance of stock under Employee Stock Purchase Plan (in shares)	21
Issuance of common stock on restricted stock units, net of shares withheld		(2,569)			(2,569)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	94
Stock-based compensation expense		5,421			5,421
Repurchase of common stock	$ (1)	(15,451)	(29,885)		(45,337)
Repurchase of common stock (in shares)	(826)
Balance at Jun. 30, 2025	$ 31	535,667	487,164	(479)	1,022,383
Balance (in shares) at Jun. 30, 2025	31,418
Increase (Decrease) in Stockholders' Equity
Net income			25,986		25,986
Foreign currency translation adjustments				(1,408)	(1,408)
Unrealized gains (losses) on available-for-sale investments				278	278
Issuance of common stock on restricted stock units, net of shares withheld		(104)			(104)
Issuance of common stock on restricted stock units, net of shares withheld (in shares)	3
Stock-based compensation expense		5,344			5,344
Repurchase of common stock		(7,956)	(24,379)		(32,335)
Repurchase of common stock (in shares)	(423)
Balance at Sep. 30, 2025	$ 31	$ 532,951	$ 488,771	$ (1,609)	$ 1,020,144
Balance (in shares) at Sep. 30, 2025	30,998