Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss, net of taxes	Retained Earnings	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2022		76,161
Beginning balance at Dec. 31, 2022	$ 418,279	$ 762	$ 302,304	$ (3,477)	$ 146,602	$ (27,912)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	11,671				11,671
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	1,207			1,207
Shares issued in connection with equity incentive plans, net of taxes (in shares)		167
Shares issued in connection with equity incentive plans, net of taxes	(870)	$ 1	(871)
Share-based compensation expense	1,973		1,973
Purchases of treasury stock	(2,223)					(2,223)
Shares issued for Deferred Compensation Plan, net	475		307			168
Shares issued for Employee Stock Purchase Plan	1,135		(139)			1,274
Other (in shares)		1
Other	19		8		11
Ending balance (in shares) at Mar. 31, 2023		76,329
Ending balance at Mar. 31, 2023	431,666	$ 763	303,582	(2,270)	158,284	(28,693)
Beginning balance (in shares) at Dec. 31, 2022		76,161
Beginning balance at Dec. 31, 2022	418,279	$ 762	302,304	(3,477)	146,602	(27,912)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	14,878
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	(1,300)
Ending balance (in shares) at Sep. 30, 2023		76,329
Ending balance at Sep. 30, 2023	432,930	$ 763	308,151	(4,777)	161,498	(32,705)
Beginning balance (in shares) at Mar. 31, 2023		76,329
Beginning balance at Mar. 31, 2023	431,666	$ 763	303,582	(2,270)	158,284	(28,693)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	8,254				8,254
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	(860)			(860)
Share-based compensation expense	2,278		2,278
Shares issued for Deferred Compensation Plan, net	(5)		(7)			2
Other	6				6
Ending balance (in shares) at Jun. 30, 2023		76,329
Ending balance at Jun. 30, 2023	441,339	$ 763	305,853	(3,130)	166,544	(28,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,047)				(5,047)
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	(1,647)			(1,647)
Share-based compensation expense	2,299		2,299
Purchases of treasury stock	(4,015)					(4,015)
Stock Issued During Period, Value, Dividend Reinvestment Plan	0		(1)			1
Other	1				1
Ending balance (in shares) at Sep. 30, 2023		76,329
Ending balance at Sep. 30, 2023	$ 432,930	$ 763	308,151	(4,777)	161,498	(32,705)
Beginning balance (in shares) at Dec. 31, 2023	73,341	76,329
Beginning balance at Dec. 31, 2023	$ 456,616	$ 763	310,436	(1,844)	185,010	(37,749)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	15,309				15,309
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	(328)			(328)
Shares issued in connection with equity incentive plans, net of taxes (in shares)		204
Shares issued in connection with equity incentive plans, net of taxes	(1,030)	$ 2	(1,032)
Share-based compensation expense	2,444		2,444
Shares issued for Deferred Compensation Plan, net	519		448			71
Shares issued for Employee Stock Purchase Plan	989		(216)			1,205
Other	62				62
Ending balance (in shares) at Mar. 31, 2024		76,533
Ending balance at Mar. 31, 2024	$ 474,581	$ 765	312,080	(2,172)	200,381	(36,473)
Beginning balance (in shares) at Dec. 31, 2023	73,341	76,329
Beginning balance at Dec. 31, 2023	$ 456,616	$ 763	310,436	(1,844)	185,010	(37,749)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	27,551
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	$ 1,320
Ending balance (in shares) at Sep. 30, 2024	73,291	76,533
Ending balance at Sep. 30, 2024	$ 488,748	$ 765	316,334	(524)	212,631	(40,458)
Beginning balance (in shares) at Mar. 31, 2024		76,533
Beginning balance at Mar. 31, 2024	474,581	$ 765	312,080	(2,172)	200,381	(36,473)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,788)				(1,788)
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	(445)			(445)
Share-based compensation expense	2,075		2,075
Purchases of treasury stock	(3,000)					(3,000)
Shares issued for Deferred Compensation Plan, net	(2)		(9)			7
Other	2				2
Ending balance (in shares) at Jun. 30, 2024		76,533
Ending balance at Jun. 30, 2024	471,423	$ 765	314,146	(2,617)	198,595	(39,466)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	14,030				14,030
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes	2,093			2,093
Share-based compensation expense	2,205		2,205
Purchases of treasury stock	(1,009)					(1,009)
Shares issued for Deferred Compensation Plan, net	0		(17)			17
Other	$ 6				6
Ending balance (in shares) at Sep. 30, 2024	73,291	76,533
Ending balance at Sep. 30, 2024	$ 488,748	$ 765	$ 316,334	$ (524)	$ 212,631	$ (40,458)