Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 194,245	$ 100,582
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,675	12,649
Amortization of premium on available-for-sale securities	2,580	1,926
(Gain) loss on deferred compensation plan investments	7,277	(3,039)
Deferred taxes, net	(1,383)	1,005
Stock-based compensation expense	82,726	60,710
Other	15	5
Changes in operating assets and liabilities:
Accounts receivable	(20,710)	(10,719)
Inventories	(100,434)	(20,237)
Other assets	51	(4,109)
Accounts payable	6,138	12,791
Accrued compensation and related benefits	24,526	9,398
Income tax liabilities	(1,751)	1,640
Other accrued liabilities	701	11,401
Net cash provided by operating activities	212,656	174,003
Cash flows from investing activities:
Purchases of property and equipment	(38,721)	(58,268)
Purchases of short-term investments	(16,243)	(255,343)
Purchases of long-term investments	(2,085)	0
Maturities and sales of short-term investments	65,793	62,789
Sales of long-term investments	200	300
Contributions to deferred compensation plan, net	(2,275)	(1,686)
Net cash provided by (used in) investing activities	6,669	(252,208)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(1,190)	(1,140)
Proceeds from common stock issued under the employee equity incentive plan	3,331	12,920
Proceeds from common stock issued under the employee stock purchase plan	2,786	2,293
Dividends and dividend equivalents paid	(65,294)	(52,222)
Net cash used in financing activities	(60,367)	(38,149)
Effect of change in exchange rates	(5,362)	1,615
Net increase (decrease) in cash, cash equivalents and restricted cash	153,596	(114,739)
Cash, cash equivalents and restricted cash, beginning of period	189,389	335,071
Cash, cash equivalents and restricted cash, end of period	342,985	220,332
Supplemental disclosures for cash flow information:
Cash paid for taxes	41,137	9,023
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	2,968	10,719
Liability accrued for dividends and dividend equivalents	$ 38,260	$ 30,564