Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net income	$ 337,337	$ 330,469
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,387	29,940
Amortization of discount on available-for-sale securities	(16,684)	(1,591)
Gain on deferred compensation plan investments	(9,180)	(3,411)
Deferred taxes, net	(6,598)	10,927
Stock-based compensation expense	149,630	108,603
Other	50	(1,447)
Changes in operating assets and liabilities:
Accounts receivable	15,148	(3,103)
Inventories	(40,535)	49,989
Other assets	57,781	(21,423)
Accounts payable	44,210	6,915
Accrued compensation and related benefits	24,450	(22,355)
Income tax liabilities	13,345	(12,797)
Other accrued liabilities	25,388	14,184
Net cash provided by operating activities	620,729	484,900
Cash flows from investing activities:
Purchases of property and equipment	(81,316)	(43,772)
Cash paid for an assumed lease	(18,175)	0
Purchases of investments	(941,451)	(492,638)
Maturities and sales of investments	779,861	328,181
Cash paid for acquisition, net of cash acquired	(33,283)	0
Contributions to deferred compensation plan, net	(1,764)	(4,466)
Net cash used in investing activities	(296,128)	(212,695)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(2,654)	(2,732)
Proceeds from common stock issued under the employee equity incentive plan	0	1,118
Proceeds from common stock issued under the employee stock purchase plan	8,727	7,568
Repurchases of common stock	(14,160)	0
Dividends and dividend equivalents paid	(178,766)	(135,265)
Net cash used in financing activities	(186,853)	(129,311)
Effect of change in exchange rates	1,552	(10,323)
Net increase in cash, cash equivalents and restricted cash	139,300	132,571
Cash, cash equivalents and restricted cash, beginning of period	561,181	288,729
Cash, cash equivalents and restricted cash, end of period	700,481	421,300
Supplemental disclosures for cash flow information:
Cash paid for income taxes, net	58,614	73,678
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	9,577	2,893
Liability accrued for dividends and dividend equivalents	$ 63,922	$ 52,509