Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Consolidated net (loss) income	$ (44,717)	$ 24,348
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	70,138	67,614
Amortization of non-cash interest	18,573	10,494
Stock-based compensation	2,235	12,618
Reserves on current assets	33,148	8,267
Purchase of in-process research and development	1,011
Net loss on strategic investments	1,411
Net loss recognized on change in fair value of derivatives	12,301
Other non-cash adjustments	7,686	6,299
Deferred income taxes	(5,712)	5,721
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	25,132	(11,602)
Inventory	(32,997)	(31,856)
Prepaid expenses and other current assets	(2,727)	(2,811)
Accounts payable and accrued liabilities	1,319	9,166
Accrued payroll and related expenses	(44,388)	(3,699)
Income taxes	(9,306)	(1,128)
Net cash provided by operating activities	33,107	93,431
Investing activities:
Acquisitions and investments		(4,100)
Purchases of intangible assets	(2,490)	(6,827)
Purchases of property and equipment	(52,065)	(65,385)
Purchases of marketable securities	(130,096)
Net cash used in investing activities	(184,651)	(76,312)
Financing activities:
Proceeds from the issuance of common stock	3,871	3,888
Purchases of treasury stock	(79,026)	(11,702)
Payment of contingent consideration	(7,053)	(809)
Proceeds from issuance of convertible debt, net of issuance costs	874,404
Proceeds from sale of warrants	93,915
Purchases of convertible note hedges	(147,825)
Other financing activities	(2,307)	1,769
Net cash provided by (used in) financing activities	735,979	(6,854)
Effect of exchange rate changes on cash	(696)	271
Increase in cash, cash equivalents and restricted cash	583,739	10,536
Cash, cash equivalents and restricted cash at beginning of period	214,528	120,235
Cash, cash equivalents and restricted cash at end of period	$ 798,267	$ 130,771

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