CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income	Total
Balance at Dec. 31, 2023	$ 754,362	$ 2,271,211	$ (912,396)	$ 325	$ 2,113,502
Balance (in shares) at Dec. 31, 2023	82,840,000
Balance (in shares) at Dec. 31, 2023			(42,615,000)
Increase (Decrease) in Stockholders' Equity
Net income		60,298			60,298
Vested employee stock awards (in shares)	269,000
Employee income tax paid on vested equity awards			$ (6,930)		(6,930)
Employee income tax paid on vested equity awards (in shares)			(117,000)
Sale of common stock under employee stock purchase plan	$ 1,446				1,446
Sale of common stock under employee stock purchase plan (in shares)	29,000
Stock based compensation expense	$ 5,510				5,510
Treasury stock purchases			$ (8,750)		(8,750)
Treasury stock purchases (in shares)			(136,000)
Net unrealized depreciation on marketable securities, net of tax				(173)	(173)
Balance at Mar. 31, 2024	$ 761,318	2,331,509	$ (928,076)	152	2,164,903
Balance (in shares) at Mar. 31, 2024	83,138,000
Balance (in shares) at Mar. 31, 2024			(42,868,000)
Balance at Dec. 31, 2024	$ 777,090	2,594,173	$ (962,650)	168	$ 2,408,781
Balance (in shares) at Dec. 31, 2024	83,639,000
Balance (in shares) at Dec. 31, 2024			(43,310,000)		(43,310,324)
Increase (Decrease) in Stockholders' Equity
Net income		100,551			$ 100,551
Vested employee stock awards (in shares)	598,000
Employee income tax paid on vested equity awards			$ (27,242)		(27,242)
Employee income tax paid on vested equity awards (in shares)			(240,000)
Sale of common stock under employee stock purchase plan	$ 1,293				1,293
Sale of common stock under employee stock purchase plan (in shares)	14,000
Stock based compensation expense	$ 4,665				4,665
Treasury stock purchases			$ (13,682)		(13,682)
Treasury stock purchases (in shares)			(141,000)
Net unrealized depreciation on marketable securities, net of tax				(75)	(75)
Balance at Mar. 31, 2025	$ 783,048	$ 2,694,724	$ (1,003,574)	$ 93	$ 2,474,291
Balance (in shares) at Mar. 31, 2025	84,251,000
Balance (in shares) at Mar. 31, 2025			(43,691,000)		(43,691,380)