CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,616,900	$ 321,514
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred taxes	(1,502,459)	1,470
Depreciation and amortization	68,769	57,194
Stock-based compensation	73,163	67,687
Non-cash operating lease cost	16,819	13,600
Allowance for doubtful accounts provisions	13,090	4,084
Impairments on equity investments	3,787	3,975
Impairments on long-lived assets	0	28,498
Gain on lease terminations	0	(6,792)
Gain from sale of equity method investment	0	(15,769)
Equity in losses of investee	0	7,528
Other non-cash operating activities	10,402	13,342
Changes in assets and liabilities, net of effects of acquisition:
Accounts receivable	(101,888)	(95,566)
Inventories	(11,774)	(40,775)
Prepaid expenses and other assets	(28,251)	(14,826)
Accounts payable	21,837	1,343
Accrued and other long-term liabilities	(28,343)	31,089
Long-term income tax payable	119	13,425
Deferred revenues	128,585	138,072
Net cash provided by operating activities	280,756	529,093
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition, net of cash acquired	(420,788)	0
Purchase of property, plant and equipment	(101,757)	(107,157)
Purchase of marketable securities	(5,341)	(588,805)
Proceeds from maturities of marketable securities	42,641	211,829
Proceeds from sales of marketable securities	278,817	194,677
Repayment on unsecured promissory note	17,828	13,185
Other investing activities	1,760	(14,062)
Net cash used in investing activities	(186,840)	(290,333)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	20,314	17,907
Common stock repurchases	0	(299,504)
Payroll taxes paid upon the vesting of equity awards	(48,674)	(55,793)
Purchase of finance lease	0	(45,773)
Net cash used in financing activities	(28,360)	(383,163)
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash	(568)	(2,098)
Net increase (decrease) in cash, cash equivalents, and restricted cash	64,988	(146,501)
Cash, cash equivalents, and restricted cash at beginning of the period	551,134	637,566
Cash, cash equivalents, and restricted cash at end of the period	$ 616,122	$ 491,065