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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 772,020 | $ 1,775,888 | $ 442,776
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Deferred taxes | 15,455 | (1,491,577) | 307
Depreciation and amortization | 108,729 | 93,538 | 78,990
Stock-based compensation | 114,336 | 98,427 | 88,184
Non-cash operating lease cost | 26,807 | 22,467 | 18,475
Allowance for doubtful accounts provisions | 2,814 | 12,073 | 5,853
Arbitration award gain | (43,403) | 0 | 0
Impairments on long-lived assets | 0 | 0 | 28,498
Equity in losses of investee | 0 | 0 | 7,528
Gain on lease terminations | 0 | 0 | (6,792)
Gain from sale of equity method investment | 0 | 0 | (15,769)
Other non-cash operating activities | 21,549 | 21,670 | 24,007
Changes in assets and liabilities, net of effects of acquisition: |  |  |
Accounts receivable | (262,066) | (139,777) | (121,014)
Inventories | (112,450) | (29,110) | (58,269)
Prepaid expenses and other assets | (124,626) | (21,130) | (31,529)
Accounts payable | 19,747 | 52,206 | 22,099
Accrued and other long-term liabilities | 158,543 | 42,168 | 60,240
Long-term income tax payable | 12,449 | (2,802) | 14,611
Deferred revenues | 462,640 | 228,133 | 189,075
Net cash provided by operating activities | 1,172,544 | 662,174 | 747,270
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Acquisition, net of cash acquired | (8,002) | (420,788) | 0
Purchase of property, plant and equipment | (401,098) | (154,916) | (149,707)
Purchase of marketable securities | (200,928) | (5,341) | (693,284)
Proceeds from maturities of marketable securities | 498 | 42,641 | 290,754
Proceeds from sales of marketable securities | 3,114 | 278,817 | 194,677
Repayment on unsecured promissory note | 4,594 | 26,925 | 21,820
Proceeds from arbitration award | 43,403 | 0 | 0
Other investing activities | (5,011) | 1,156 | (14,704)
Net cash used in investing activities | (563,430) | (231,506) | (350,444)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 25,623 | 20,314 | 17,907
Common stock repurchases | (375,038) | 0 | (399,999)
Payroll taxes paid upon the vesting of equity awards | (108,917) | (51,122) | (57,675)
Purchase of finance lease | 0 | 0 | (45,773)
Net cash used in financing activities | (458,332) | (30,808) | (485,540)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash | (12,117) | 10,480 | 2,282
Net increase (decrease) in cash, cash equivalents, and restricted cash | 138,665 | 410,340 | (86,432)
Cash, cash equivalents, and restricted cash at beginning of year | 961,474 | 551,134 | 637,566
Cash, cash equivalents, and restricted cash at end of the period | $ 1,100,139 | $ 961,474 | $ 551,134

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