Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 209,306	$ 194,245
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,940	18,690
Amortization of premium on available-for-sale securities	56	2,580
(Gain) loss on deferred compensation plan investments	(5,022)	7,277
Gain on sales of equity investment	(1,424)	0
Deferred taxes, net	(984)	(1,383)
Stock-based compensation expense	75,001	82,726
Changes in operating assets and liabilities:
Accounts receivable	13,544	(20,710)
Inventories	19,847	(100,434)
Other assets	(4,881)	51
Accounts payable	12,653	6,138
Accrued compensation and related benefits	(20,613)	24,526
Income tax liabilities	(14,802)	(1,751)
Other accrued liabilities	6,371	701
Net cash provided by operating activities	308,992	212,656
Cash flows from investing activities:
Purchases of property and equipment	(16,681)	(38,721)
Purchases of investments	(211,407)	(18,328)
Maturities and sales of investments	232,206	65,993
Contributions to deferred compensation plan, net	(3,855)	(2,275)
Net cash provided by investing activities	263	6,669
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(1,192)	(1,190)
Proceeds from common stock issued under the employee equity incentive plan	1,114	3,331
Proceeds from common stock issued under the employee stock purchase plan	3,737	2,786
Dividends and dividend equivalents paid	(85,863)	(65,294)
Net cash used in financing activities	(82,204)	(60,367)
Effect of change in exchange rates	(8,696)	(5,362)
Net increase in cash, cash equivalents and restricted cash	218,355	153,596
Cash, cash equivalents and restricted cash, beginning of period	288,729	189,389
Cash, cash equivalents and restricted cash, end of period	507,084	342,985
Supplemental disclosures for cash flow information:
Cash paid for income taxes, net	58,216	41,137
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	2,586	2,968
Liability accrued for dividends and dividend equivalents	$ 51,037	$ 38,260