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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 445,053 | $ 361,573 | $ 772,020
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred taxes | (18,642) | (39,495) | 15,455
Depreciation and amortization | 142,401 | 125,793 | 108,729
Stock-based compensation | 154,026 | 133,367 | 114,336
Non-cash operating lease cost | 33,107 | 30,520 | 26,807
Impairments on equity investments | 4,990 | 0 | 0
Arbitration award gain | 0 | 0 | (43,403)
Other non-cash operating activities | 32,733 | 41,288 | 24,363
Changes in assets and liabilities, net of effects of acquisitions: |  |  |
Accounts receivable | (104,614) | 21,549 | (262,066)
Inventories | 30,169 | (130,097) | (112,450)
Prepaid expenses and other assets | (51,013) | (65,514) | (124,626)
Accounts payable | (7,703) | (36,523) | 19,747
Accrued and other long-term liabilities | 46,327 | (121,942) | 158,543
Long-term income tax payable | (7,772) | 6,327 | 12,449
Deferred revenues | 86,714 | 241,886 | 462,640
Net cash provided by operating activities | 785,776 | 568,732 | 1,172,544
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Acquisitions, net of cash acquired | 0 | (12,304) | (8,002)
Purchase of property, plant and equipment | (177,716) | (291,900) | (401,098)
Purchase of marketable securities | (2,910) | (28,002) | (200,928)
Proceeds from maturities of marketable securities | 55,170 | 23,785 | 498
Proceeds from sales of marketable securities | 6,234 | 97,316 | 3,114
Repayment on unsecured promissory note | 0 | 0 | 4,594
Proceeds from arbitration award | 0 | 0 | 43,403
Purchase of equity investments | (76,999) | 0 | 0
Other investing activities | 278 | (2,211) | (5,011)
Net cash used in investing activities | (195,943) | (213,316) | (563,430)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 26,595 | 26,149 | 25,623
Common stock repurchases | (592,360) | (435,036) | (375,038)
Activity for equity forward contracts related to accelerated stock repurchase agreements, net | (10,000) | (40,000) | 0
Payroll taxes paid upon the vesting of equity awards | (22,575) | (52,799) | (108,917)
Net cash used in financing activities | (598,340) | (501,686) | (458,332)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | 4,671 | (11,514) | (12,117)
Net (decrease) increase in cash, cash equivalents, and restricted cash | (3,836) | (157,784) | 138,665
Cash, cash equivalents, and restricted cash at beginning of year | 942,355 | 1,100,139 | 961,474
Cash, cash equivalents, and restricted cash at end of year | $ 938,519 | $ 942,355 | $ 1,100,139

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