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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 200,376 $ 1,518,131
Adjustments to reconcile net income to net cash provided by operating activities:    
Deferred taxes 28,979 (1,487,154)
Depreciation and amortization 25,635 20,738
Stock-based compensation 27,241 22,927
Non-cash operating lease cost 5,911 5,546
Allowance for doubtful accounts provisions 455 4,838
Arbitration award gain (43,403) 0
Impairment on equity investment 0 2,900
Other non-cash operating activities 5,340 7,728
Changes in assets and liabilities:    
Accounts receivable (67,423) 13,761
Inventories (15,582) (10,496)
Prepaid expenses and other assets (34,858) (37,244)
Accounts payable (14,936) (12,034)
Accrued and other long-term liabilities (475) (69,103)
Long-term income tax payable 3,920 6,354
Deferred revenues 106,007 22,892
Net cash provided by operating activities 227,187 9,784
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (43,431) (46,085)
Purchase of marketable securities 0 (5,341)
Proceeds from maturities of marketable securities 0 42,641
Proceeds from sales of marketable securities 0 278,817
Repayment on unsecured promissory note 4,594 4,419
Proceeds from arbitration award 43,403 0
Other investing activities 0 1,760
Net cash provided by investing activities 4,566 276,211
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 13,133 10,662
Payroll taxes paid upon the vesting of equity awards (66,568) (45,395)
Net cash used in financing activities (53,435) (34,733)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash (7,487) (11,007)
Net increase in cash, cash equivalents, and restricted cash 170,831 240,255
Cash, cash equivalents, and restricted cash at beginning of the period 961,474 551,134
Cash, cash equivalents, and restricted cash at end of the period $ 1,132,305 $ 791,389