Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 192,115	$ 190,314
Adjustments to reconcile net income to net cash provided by operating activities:
Intangible asset amortization	51,851	49,379
Share-based compensation	52,453	49,616
Depreciation	6,223	5,044
Acquired in-process research and development	2,000	8,750
Loss on disposal of property and equipment	457	37
Deferred income taxes	(29,956)	(10,112)
Provision for losses on accounts receivable and inventory	1,548	1,688
Amortization of debt discount and deferred financing costs	11,379	10,776
Other non-cash transactions	8,000	967
Changes in assets and liabilities:
Accounts receivable	(3,038)	(22,158)
Inventories	(5,879)	(15,050)
Prepaid expenses and other current assets	(870)	(10,335)
Other long-term assets	(2,267)	(247)
Accounts payable	5,347	6,224
Accrued liabilities	(33,072)	(3,734)
Income taxes payable	2,487	3,398
Deferred revenue	25,320	(476)
Other non-current liabilities	15,533	14,587
Net cash provided by operating activities	299,631	278,668
Investing activities
Purchases of property and equipment	(11,725)	(6,028)
Acquisition of in-process research and development	(2,000)	(8,750)
Acquisition of investments	(20,000)	(53,484)
Acquisition of intangible assets	0	(150,000)
Net cash used in investing activities	(33,725)	(218,262)
Financing activities
Proceeds from employee equity incentive and purchase plans	19,071	14,611
Repayments of long-term debt	(18,047)	(19,282)
Payment of employee withholding taxes related to share-based awards	(16,320)	(14,278)
Share repurchases	(30,859)	(163,244)
Repayments under revolving credit facility	(350,000)	0
Net cash used in financing activities	(396,155)	(182,193)
Effect of exchange rates on cash and cash equivalents	3,499	968
Net decrease in cash and cash equivalents	(126,750)	(120,819)
Cash and cash equivalents, at beginning of period	365,963	988,785
Cash and cash equivalents, at end of period	$ 239,213	$ 867,966