CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total
Beginning Balance (in shares) at Dec. 31, 2021	59,913
Beginning balance at Dec. 31, 2021	$ 28	$ 162,301	$ (3,737)	$ 753,440	$ 912,032
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock award plans (in shares)	731
Issuance of common stock under employee stock option and stock award plans		257			257
Repurchase of common stock (in shares)	(3,770)
Repurchase of common stock	$ (4)	(190,827)		(120,263)	(311,094)
Issuance of common stock under employee stock purchase plan (in shares)	87
Issuance of common stock under employee stock purchase plan		5,905			5,905
Stock-based compensation expense related to employee stock awards		20,494			20,494
Stock-based compensation expense related to employee stock purchases		1,870			1,870
Payment of dividends to stockholders				(41,492)	(41,492)
Unrealized actuarial gain (loss) on pension benefits			1,536		1,536
Unrealized gain (loss) on marketable securities			(4,158)		(4,158)
Foreign currency translation adjustment			(985)		(985)
Net income				170,851	170,851
Ending Balance (in shares) at Dec. 31, 2022	56,961
Ending balance at Dec. 31, 2022	$ 24		(7,344)	762,536	755,216
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock award plans (in shares)	476
Repurchase of common stock (in shares)	(784)
Repurchase of common stock	$ (1)	(34,765)		(20,583)	(55,349)
Issuance of common stock under employee stock purchase plan (in shares)	85
Issuance of common stock under employee stock purchase plan		6,237			6,237
Stock-based compensation expense related to employee stock awards		26,624			26,624
Stock-based compensation expense related to employee stock purchases		1,904			1,904
Payment of dividends to stockholders				(44,008)	(44,008)
Unrealized actuarial gain (loss) on pension benefits			723		723
Unrealized gain (loss) on marketable securities			5,579		5,579
Foreign currency translation adjustment			(420)		(420)
Net income				55,735	55,735
Ending Balance (in shares) at Dec. 31, 2023	56,738
Ending balance at Dec. 31, 2023	$ 23		(1,462)	753,680	752,241
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock option and stock award plans (in shares)	410
Repurchase of common stock (in shares)	(402)
Repurchase of common stock	$ (1)	(22,042)		(5,838)	(27,881)
Issuance of common stock under employee stock purchase plan (in shares)	91
Issuance of common stock under employee stock purchase plan		5,700			5,700
Stock-based compensation expense related to employee stock awards		33,404			33,404
Stock-based compensation expense related to employee stock purchases		1,672			1,672
Payment of dividends to stockholders				(46,037)	(46,037)
Unrealized actuarial gain (loss) on pension benefits			(1,486)		(1,486)
Unrealized gain (loss) on marketable securities			437		437
Foreign currency translation adjustment			(512)		(512)
Net income				32,234	32,234
Ending Balance (in shares) at Dec. 31, 2024	56,837
Ending balance at Dec. 31, 2024	$ 22	$ 18,734	$ (3,023)	$ 734,039	$ 749,772