CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 113,234	$ 215,525	$ 279,881
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	54,768	54,505	43,774
Depreciation of property, plant, and equipment	17,270	16,347	16,616
Loss (gain) on disposal of property, plant, and equipment	229	19	33
Amortization of intangible assets	4,610	3,274	3,667
Non-cash, loss from catastrophes	0	46,372	0
Excess and obsolete inventory charges	3,775	3,084	2,573
Fair value adjustment on acquired inventories (Note 21)	2,829	0	0
Amortization of discounts or premiums on investments	1,745	4,968	4,887
Realized (gain) loss on sale of investments	1,954	182	(236)
Change in deferred income taxes	(19,779)	(27,338)	(3,118)
Accounts receivable	23,346	3,454	(4,503)
Unbilled revenue	(255)	1,806	1,637
Inventories	(22,591)	(48,934)	(54,920)
Prepaid expenses and other current assets	2,469	(6,998)	(32,342)
Accounts payable	(13,744)	(17,277)	27,828
Accrued expenses	(35,309)	2,056	16,861
Accrued income taxes	(16,745)	(444)	(6,401)
Deferred revenue and customer deposits	(9,122)	4,886	14,417
Other	4,232	(12,081)	3,411
Net cash provided by operating activities	112,916	243,406	314,065
Cash flows from investing activities:
Purchases of investments	(184,056)	(233,720)	(668,053)
Maturities and sales of investments	496,462	253,983	430,969
Purchases of property, plant, and equipment	(23,077)	(19,667)	(15,455)
Net payments related to business acquisitions	(257,056)	(5,050)	0
Net cash provided by (used in) investing activities	32,273	(4,454)	(252,539)
Cash flows from financing activities:
Net payments from issuance of common stock under stock plans	3,268	9,861	63,292
Repurchase of common stock	(79,794)	(204,314)	(161,652)
Payment of dividends	(49,079)	(45,921)	(43,263)
Net cash used in financing activities	(125,605)	(240,374)	(141,623)
Effect of foreign exchange rate changes on cash and cash equivalents	1,697	(3,365)	(2,815)
Net change in cash and cash equivalents	21,281	(4,787)	(82,912)
Cash and cash equivalents at beginning of year	181,374	186,161	269,073
Cash and cash equivalents at end of year	$ 202,655	$ 181,374	$ 186,161