Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Apr. 02, 2023
Cash flows from operating activities:
Net income	$ 12,022	$ 25,615
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	13,302	16,579
Depreciation of property, plant, and equipment	5,279	3,986
Amortization of intangible assets	2,813	942
Excess and obsolete inventory charges	471	788
Fair Value Adjustment on Acquired Inventories	1,224	0
Amortization of discounts or premiums on investments	306	700
Realized (gain) loss on sale of investments	(2)	0
Change in deferred income taxes	(3,333)	(10,656)
Accounts receivable	(25,669)	(18,455)
Unbilled revenue	(347)	(173)
Inventories	(10,938)	(5,338)
Prepaid expenses and other current assets	(3,395)	231
Accounts payable	7,398	(192)
Accrued expenses	(470)	(9,942)
Accrued income taxes	5,258	4,721
Deferred revenue and customer deposits	8,737	17,003
Other	987	1,744
Net cash provided by (used in) operating activities	13,643	27,553
Cash flows from investing activities:
Purchases of investments	(233,726)	(46,480)
Maturities and sales of investments	189,758	46,199
Purchases of property, plant, and equipment	(4,061)	(5,507)
Net payments related to business acquisitions (Note 17)	(994)	0
Net cash provided by (used in) investing activities	(49,023)	(5,788)
Cash flows from financing activities:
Net payments from issuance of common stock under stock plans	(2,861)	(3,055)
Repurchase of common stock	(9,339)	(24,178)
Payment of dividends	(12,888)	(12,091)
Net cash provided by (used in) financing activities	(25,088)	(39,324)
Effect of foreign exchange rate changes on cash and cash equivalents	(3,328)	356
Net change in cash and cash equivalents	(63,796)	(17,203)
Cash and cash equivalents at beginning of period	202,655	181,374
Cash and cash equivalents at end of period	$ 138,859	$ 164,171