Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit / Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Dec. 31, 2021	$ 33	$ 559,883	$ (22,722)	$ 1,765	$ 538,959
Balance (in shares) at Dec. 31, 2021	33,240
Increase (Decrease) in Stockholders' Equity
Net income			183,079		183,079
Foreign currency translation adjustments				(4,058)	(4,058)
Change in pension obligation, net of tax				325	325
Exercise of stock options (in shares)	103
Exercise of stock options		1,247			1,247
Issuance of stock under Employee Stock Purchase Plan		1,662			1,662
Issuance of stock under Employee Stock Purchase Plan (in shares)	29
Issuance of restricted shares of common stock		(9,907)			(9,907)
Issuance of restricted shares of common stock (in shares)	291
Stock-based compensation expense		13,444			13,444
Repurchase of common stock		(16,030)	(41,465)		(57,495)
Repurchase of common stock (in shares)	(888)
Balance at Dec. 31, 2022	$ 33	550,299	118,892	(1,968)	667,256
Balance (in shares) at Dec. 31, 2022	32,775
Increase (Decrease) in Stockholders' Equity
Net income			246,263		246,263
Foreign currency translation adjustments				38	38
Change in pension obligation, net of tax				84	84
Exercise of stock options (in shares)	3
Exercise of stock options		25			25
Issuance of stock under Employee Stock Purchase Plan		2,057			2,057
Issuance of stock under Employee Stock Purchase Plan (in shares)	16
Issuance of restricted shares of common stock		(16,611)			(16,611)
Issuance of restricted shares of common stock (in shares)	271
Stock-based compensation expense		18,269			18,269
Repurchase of common stock		(6,850)	(45,649)		(52,499)
Repurchase of common stock (in shares)	(380)
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			200,992		200,992
Foreign currency translation adjustments				(4,297)	(4,297)
Change in pension obligation, net of tax				(71)	(71)
Issuance of stock under Employee Stock Purchase Plan		2,385			2,385
Issuance of stock under Employee Stock Purchase Plan (in shares)	30
Issuance of restricted shares of common stock		(11,563)			(11,563)
Issuance of restricted shares of common stock (in shares)	194
Stock-based compensation expense		20,951			20,951
Repurchase of common stock	$ (1)	(10,308)	(50,180)		(60,489)
Repurchase of common stock (in shares)	(544)
Balance at Dec. 31, 2024	$ 32	$ 548,654	$ 470,318	$ (6,214)	$ 1,012,790
Balance (in shares) at Dec. 31, 2024	32,365