CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balance at Dec. 31, 2022	$ 734,426	$ 2,236,869	$ (619,862)	$ (3,802)	$ 2,347,631
Balance (in shares) at Dec. 31, 2022	82,593		(31,994)
Increase (Decrease) in Stockholders' Equity
Net Income (loss)		(22,071)			(22,071)
Vested employee stock awards	$ 57				57
Vested employee stock awards (in shares)	130
Employee income tax paid on vested equity awards			$ (585)		(585)
Employee income tax paid on vested equity awards (in shares)			(32)
Sale of common stock under employee stock purchase plan	$ 1,218				1,218
Sale of common stock under employee stock purchase plan (in shares)	78
Stock based compensation expense	$ 4,329				4,329
Treasury stock purchases			$ (100,001)		(100,001)
Treasury stock purchases (in shares)			(5,067)
Net unrealized appreciation (depreciation) on marketable securities, net of tax				1,480	1,480
Balance at Mar. 31, 2023	$ 740,030	2,214,798	$ (720,448)	(2,322)	2,232,058
Balance (in shares) at Mar. 31, 2023	82,801		(37,093)
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		(42,615)
Increase (Decrease) in Stockholders' Equity
Net Income (loss)		60,298			60,298
Vested employee stock awards (in shares)	269
Employee income tax paid on vested equity awards			$ (6,930)		(6,930)
Employee income tax paid on vested equity awards (in shares)			(117)
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
Stock based compensation expense	$ 5,510				5,510
Treasury stock purchases			$ (8,750)		(8,750)
Treasury stock purchases (in shares)			(136)
Net unrealized appreciation (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		(42,868)