Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities:
Net income	$ 267,517	$ 192,907
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,569	16,942
Amortization of discount on available-for-sale securities	(2,885)	(10,040)
Gain on deferred compensation plan investments	(4,230)	(5,285)
Deferred taxes, net	17,040	(5,821)
Stock-based compensation expense	112,904	98,232
Other	29	77
Changes in operating assets and liabilities:
Accounts receivable	(22,264)	21,951
Inventories	(71,018)	(42,350)
Other assets	83,395	60,590
Accounts payable	36,627	30,725
Accrued compensation and related benefits	15,584	8,353
Income tax liabilities	33,798	7,459
Other accrued liabilities	2,958	15,286
Net cash provided by operating activities	494,024	389,026
Cash flows from investing activities:
Purchases of property and equipment	(88,485)	(47,498)
Purchases of intangible assets	(2,000)	(18,175)
Purchases of investments	(393,010)	(589,615)
Maturities and sales of investments	211,227	420,514
Cash paid for acquisition, net of cash acquired	0	(33,283)
Contributions to deferred compensation plan	(1,015)	(1,309)
Net cash used in investing activities	(273,283)	(269,366)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(1,902)	(2,010)
Proceeds from common stock issued under the employee stock purchase plan	5,335	4,606
Repurchases of common stock	(3,687)	(8,626)
Dividends and dividend equivalents paid	(135,073)	(117,608)
Net cash used in financing activities	(135,327)	(123,638)
Effect of change in exchange rates	10,169	(6,603)
Net increase (decrease) in cash, cash equivalents and restricted cash	95,583	(10,581)
Cash, cash equivalents and restricted cash, beginning of period	691,941	561,181
Cash, cash equivalents and restricted cash, end of period	787,524	550,600
Supplemental disclosures for cash flow information:
Cash paid for income taxes, net	17,007	34,064
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	6,108	7,488
Liability accrued for dividends and dividend equivalents	$ 77,193	$ 62,949