CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (12,244)	$ (7,168)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	25,181	20,614
Deferred income taxes	(942)	1,265
Share-based compensation	14,768	18,266
(Gain) loss on investments, net	(858)	112
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable	15,532	(4,677)
Inventories	(10,457)	4,361
Prepaid expenses and other assets	(3,693)	2,305
Accounts payable	4,931	3,340
Accrued liabilities and other liabilities	2,783	10,177
Net cash provided by operating activities	35,001	48,595
Cash flows from investing activities:
Purchase of severance-related insurance policies	(315)	(226)
Purchase of short-term investments	(50,302)	(64,908)
Proceeds from sales of short-term investments	54,242	199,932
Proceeds from maturities of short-term investments	1,815	77,715
Purchase of property and equipment	(15,911)	(8,283)
Purchase of intangible assets	(1,115)	0
Purchase of investments in private companies	(11,000)	(107)
Acquisition, net of cash acquired of $87.5 million	0	(681,189)
Net cash used in investing activities	(22,586)	(477,066)
Cash flows from financing activities:
Proceeds from term debt	0	280,000
Principal payments on term debt	(20,000)	0
Term debt issuance costs	0	(5,521)
Payments on capital lease and intangible asset financings	(2,514)	(274)
Proceeds from issuances of ordinary shares through employee equity incentive plans	11,676	8,979
Net cash provided by (used in) financing activities	(10,838)	283,184
Net increase (decrease) in cash and cash equivalents	1,577	(145,287)
Cash and cash equivalents at beginning of period	56,780	263,199
Cash and cash equivalents at end of period	58,357	117,912
Supplemental disclosure of non-cash investing and financing activities
Intangible assets financed with debt	3,220	0
Unpaid property and equipment	1,510	581
Transfer from inventory to property and equipment	$ 633	$ 975