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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 247,098 | $ 400,090
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Deferred taxes | 14,747 | 39,961
Depreciation and amortization | 59,907 | 51,527
Stock-based compensation | 65,761 | 56,096
Non-cash operating lease cost | 15,075 | 12,413
Arbitration award gain | 0 | (43,403)
Other non-cash operating activities | 16,172 | 13,174
Changes in assets and liabilities: |  |
Accounts receivable | (53,462) | (164,822)
Inventories | (91,060) | (49,070)
Prepaid expenses and other assets | (14,219) | (70,132)
Accounts payable | (23,944) | (5,736)
Accrued and other long-term liabilities | (212,896) | 65,650
Long-term income tax payable | (1,657) | 7,535
Deferred revenues | 136,021 | 231,408
Net cash provided by operating activities | 157,543 | 544,691
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchase of property, plant and equipment | (163,348) | (167,668)
Purchase of marketable securities | (20,466) | 0
Proceeds from maturities of marketable securities | 21,690 | 0
Proceeds from sales of marketable securities | 92,235 | 0
Repayment on unsecured promissory note | 0 | 4,594
Proceeds from arbitration award | 0 | 43,403
Other investing activities | (2,189) | (4,249)
Net cash used in investing activities | (72,078) | (123,920)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of common stock | 14,827 | 13,133
Common stock repurchases | (275,036) | (160,000)
Payments for equity forward contracts related to accelerated share repurchase agreements | 0 | (40,000)
Payroll taxes paid upon the vesting of equity awards | (52,187) | (104,889)
Net cash used in financing activities | (312,396) | (291,756)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | 4,978 | (3,511)
Net (decrease) increase in cash, cash equivalents, and restricted cash | (221,953) | 125,504
Cash, cash equivalents, and restricted cash at beginning of the period | 1,100,139 | 961,474
Cash, cash equivalents, and restricted cash at end of the period | $ 878,186 | $ 1,086,978

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