CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 218,990	$ 201,971
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes	5,606	3,667
Depreciation and amortization	46,169	24,066
Impairments on long-lived assets	28,498	0
Impairment on equity investment	3,975	0
Gain from sale of equity method investment	(15,769)	0
Stock-based compensation	43,511	32,720
Equity in losses of investee	7,528	5,478
Other non-cash operating activities	12,788	4,543
Changes in assets and liabilities:
Accounts receivable	(89,055)	(44,266)
Inventories	(26,681)	(15,586)
Prepaid expenses and other assets	(48,949)	(9,366)
Accounts payable	1,847	10,743
Accrued and other long-term liabilities	1,321	(53,442)
Long-term income tax payable	9,608	1,610
Deferred revenues	95,174	54,983
Net cash provided by operating activities	294,561	217,121
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(80,598)	(115,295)
Purchase of marketable securities	(353,995)	(78,405)
Proceeds from maturities of marketable securities	107,021	207,475
Proceeds from sales of marketable securities	14,456	9,560
Proceeds from Collection of Notes Receivable	6,598	0
Loan repayment from equity investee	0	30,000
Other investing activities	(14,502)	668
Net cash (used in) provided by investing activities	(321,020)	54,003
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	9,614	8,585
Common stock repurchases	(99,504)	(100,000)
Employees’ taxes paid upon the vesting of restricted stock units	(52,718)	(79,330)
Purchase of finance lease	(45,773)	0
Net cash used in financing activities	(188,381)	(170,745)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	1,467	(1,923)
Net (decrease) increase in cash, cash equivalents, and restricted cash	(213,373)	98,456
Cash, cash equivalents, and restricted cash at beginning of the period	637,566	450,125
Cash, cash equivalents, and restricted cash at end of the period	$ 424,193	$ 548,581

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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