Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 427,374	$ 437,672	$ 242,023
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	40,168	37,114	28,699
Amortization of premium (discount) on available-for-sale securities	(5,277)	4,375	4,674
Loss (gain) on deferred compensation plan investments	(8,505)	6,600	(4,563)
Deferred taxes, net	5,865	(13,220)	(2,772)
Gain on sale of equity investment	(1,424)	0	0
Stock-based compensation expense	149,711	160,992	123,479
Other	(23)	97	110
Changes in operating assets and liabilities:
Accounts receivable	2,884	(77,903)	(37,976)
Inventories	63,583	(188,073)	(102,323)
Other assets	(24,310)	(177,284)	(15,311)
Accounts payable	4,797	(11,240)	32,926
Accrued compensation and related benefits	(31,187)	28,514	16,536
Income tax liabilities	(308)	16,559	11,771
Other accrued liabilities	14,865	22,471	22,737
Net cash provided by operating activities	638,213	246,674	320,010
Cash flows from investing activities:
Purchases of property and equipment	(57,578)	(58,843)	(94,420)
Purchases of investments	(582,603)	(65,785)	(394,886)
Maturities and sales of investments	468,308	128,610	113,755
Contributions to deferred compensation plan, net	(6,853)	(16,492)	(2,542)
Purchases of intangible assets	0	0	(793)
Net cash used in investing activities	(178,726)	(12,510)	(378,886)
Cash flows from financing activities:
Property and equipment purchased on extended payment terms	(2,826)	(2,055)	(2,834)
Proceeds from common stock issued under the employee equity incentive plan	1,118	5,358	17,322
Proceeds from common stock issued under the employee stock purchase plan	7,568	5,877	4,670
Repurchase of common stock	(3,741)	0	0
Dividends and dividend equivalents paid	(185,844)	(137,965)	(109,364)
Net cash used in financing activities	(183,725)	(128,785)	(90,206)
Effect of change in exchange rates	(3,310)	(6,039)	3,400
Net increase (decrease) in cash, cash equivalents and restricted cash	272,452	99,340	(145,682)
Cash, cash equivalents and restricted cash, beginning of period	288,729	189,389	335,071
Cash, cash equivalents and restricted cash, end of period	561,181	288,729	189,389
Supplemental disclosures for cash flow information:
Cash paid for income taxes, net	85,128	85,031	21,148
Non-cash investing and financing activities:
Liability accrued for property and equipment purchases	1,784	5,743	17,877
Liability accrued for dividends and dividend equivalents	$ 53,213	$ 40,939	$ 33,059