Consolidated Statements of Equity - USD ($)		Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2020		$ 747,717,000	$ 856,000	$ 1,029,453,000	$ (282,592,000)
Balance, Shares at Dec. 31, 2020			85,593,000
Net Income (Loss)		130,964,000			130,964,000
Net loss attributable to noncontrolling interest	[1]	(27,000)			(27,000)
Unrealized holding loss on investments, net of tax	[1]	(2,213,000)			(2,213,000)
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan		6,852,000	$ 3,000	6,849,000
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares			321,000
Issuance of restricted stock			736,000
Issuance of restricted stock Value			$ 7,000	(7,000)
Stock-based compensation expense		18,118,000		18,118,000
Forfeitures of restricted stock			$ 0	0
Forfeitures of restricted stock, shares			(55,000)
Repurchased common stock		(4,719,000)	$ (2,000)	(4,717,000)
Repurchased common stock, shares			(172,000)
Balance at Dec. 31, 2021		896,692,000	$ 864,000	1,049,696,000	(153,868,000)
Balance, Shares at Dec. 31, 2021			86,423,000
Net Income (Loss)		66,335,000			66,335,000
Net loss attributable to noncontrolling interest		(4,000)
Dissolution of and net loss attributable to noncontrolling interest	[1]	(206,000)		8,000	(214,000)
Unrealized holding loss on investments, net of tax	[1]	(5,051,000)			(5,051,000)
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan		5,396,000	$ 3,000	5,393,000
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares			287,000
Issuance of restricted stock			841,000
Issuance of restricted stock Value			$ 8,000	(8,000)
Stock-based compensation expense		16,977,000		16,977,000
Forfeitures of restricted stock			$ 1,000	(1,000)
Forfeitures of restricted stock, shares			(60,000)
Repurchased common stock		(88,511,000)	$ (45,000)	(88,466,000)
Repurchased common stock, shares			(4,544,000)
Balance at Dec. 31, 2022		891,632,000	$ 829,000	983,601,000	(92,798,000)
Balance, Shares at Dec. 31, 2022			82,947,000
Net Income (Loss)		(60,408,000)			(60,408,000)
Net loss attributable to noncontrolling interest		0
Unrealized holding loss on investments, net of tax	[1]	1,521,000			1,521,000
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan		4,912,000	$ 4,000	4,908,000
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares			407,000
Issuance of restricted stock			964,000
Issuance of restricted stock Value			$ 10,000	(10,000)
Stock-based compensation expense		12,323,000		12,323,000
Forfeitures of restricted stock			$ 2,000	2,000
Forfeitures of restricted stock, shares			(239,000)
Repurchased common stock		$ (919,000)	$ (1,000)	(918,000)
Repurchased common stock, shares		0	(61,000)
Balance at Dec. 31, 2023		$ 849,061,000	$ 840,000	$ 999,906,000	$ (151,685,000)
Balance, Shares at Dec. 31, 2023			84,018,000

[1] Presented within retained (deficit) earnings as the balance is immaterial.