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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income $ 396,520 $ 312,199
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 60,898 49,637
Stock-based compensation 155,899 135,741
Deferred income taxes (92,919) 40,432
Other, net (543) 15,097
Unrealized (gain) loss on long term investments (9,839) 72,142
Loss (gain) on change in fair value of acquisition-related contingent consideration 14,144 (12,198)
Changes in operating assets and liabilities:    
Accounts receivable (12,384) (1,888)
Prepaid expenses and other assets (62,081) (40,016)
Inventory (77,193) (48,316)
Accounts payable (138,135) (8,935)
Accrued and other liabilities 114,391 172,384
Net cash provided by operating activities 348,758 686,279
Cash flows from investing activities:    
Purchase of long term investments (10,000) 0
Sale of long term investments 45 0
Capital expenditures (30,219) (56,560)
Payments for intangible assets (15,000) 0
Purchases of marketable securities (222,228) (59,058)
Sale and maturities of marketable securities 224,225 57,988
Net cash used in investing activities (53,177) (57,630)
Cash flows from financing activities:    
Proceeds from issuance of common stock under stock plans 28,319 42,989
Tax withholdings related to restricted and performance share vesting (28,061) (25,724)
Payment of finance lease liabilities (2,523) (2,106)
Payment of contingent consideration (18,114) (13,473)
Net cash (used in) provided by financing activities (20,379) 1,686
Effect of exchange rates on cash, cash equivalents, restricted cash and investments 625 2,728
Net increase in cash, cash equivalents, restricted cash and investments 275,827 633,063
Cash, cash equivalents, restricted cash and investments at beginning of period 2,953,120 2,059,160
Cash, cash equivalents, restricted cash and investments at end of period 3,228,947 2,692,223
Supplemental Schedule of Cash Flow Information    
Income taxes paid 253,180 116,537
Unpaid purchases of property and equipment 11 8,836
Leased assets obtained in exchange for new operating lease liabilities 5,275 3,650
Leased assets obtained in exchange for new finance lease liabilities $ 1,176 $ 1,448