Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Statement of Cash Flows [Abstract]
Net income	$ 156,495		$ 200,879
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	135,515	[1]	104,703	[1]
Depreciation and amortization of property and equipment	101,301		93,939
Amortization of debt discount and transaction costs	14,504		0
Stock-based compensation expense	128,440		137,306
Loss (gain) on investments	2,688		(2,298)
Provision for doubtful accounts	2,087		1,267
Provision for product returns	2,603		3,471
Provision for inventory	1,966		1,529
Excess tax benefit from stock-based compensation	(5,122)		(16,285)
Deferred income tax benefit	(25,114)		(43,203)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	825		3,181
Other non-cash items	378		374
Total adjustments to reconcile net income to net cash provided by operating activities	360,071		283,984
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	182,542		182,039
Inventories	(4,342)		(3,088)
Prepaid expenses and other current assets	(5,763)		(7,510)
Other assets	1,651		4,841
Income taxes, net	(87,180)		(29,688)
Accounts payable	7,526		(4,949)
Accrued expenses and other current liabilities	53,846		10,783
Deferred revenues	(8,183)		59,891
Other liabilities	(1,113)		1,467
Total changes in operating assets and liabilities, net of the effects of acquisitions	138,984		213,786
Net cash provided by operating activities	655,550		698,649
Investing Activities
Purchases of available-for-sale investments	(1,891,045)		(1,427,698)
Proceeds from sales of available-for-sale investments	1,342,500		486,822
Proceeds from maturities of available-for-sale investments	282,711		409,556
Purchases of property and equipment	(115,442)		(126,610)
Proceeds related to cost method investments	3,907		2,811
Purchases of cost method investments	(2,823)		(5,095)
Cash paid for acquisitions, net of cash acquired	(43,342)		(329,343)
Cash paid for licensing agreements and product related intangible assets	(12,712)		(7,202)
Net cash used in investing activities	(436,246)		(996,759)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	38,674		68,570
Proceeds from issuance of convertible notes, net of issuance costs	1,415,717		0
Purchase of convertible note hedges	(184,288)		0
Proceeds from issuance of warrants	101,775		0
Repayment of acquired debt	(3,766)		0
Excess tax benefit from stock-based compensation	5,122		16,285
Stock repurchases, net	(1,600,986)		(156,334)
Cash paid for tax withholding on vested stock awards	(27,777)		(27,708)
Other	0		912
Net cash used in financing activities	(255,529)		(98,275)
Effect of exchange rate changes on cash and cash equivalents	(1,728)		(751)
Change in cash and cash equivalents	(37,953)		(397,136)
Cash and cash equivalents at beginning of period	280,740		643,609
Cash and cash equivalents at end of period	$ 242,787		$ 246,473

[1] Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.