Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Statement of Cash Flows [Abstract]
Net income	$ 108,963		$ 124,149
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	101,600	[1]	69,987	[1]
Depreciation and amortization of property and equipment	67,195		60,499
Amortization of debt discount and transaction costs	5,780		0
Stock-based compensation expense	85,991		91,413
Loss (gain) on investments	3,352		(1,032)
Provision for doubtful accounts	1,375		1,066
Provision for product returns	1,187		3,056
Provision for inventory	988		638
Tax effect of stock-based compensation	(4,696)		15,112
Excess tax benefit from stock-based compensation	(3,004)		(11,944)
Deferred income tax benefit	(12,399)		(25,249)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	(2,107)		2,936
Other non-cash items	175		220
Total adjustments to reconcile net income to net cash provided by operating activities	245,437		206,702
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	146,204		137,994
Inventories	(1,087)		(3,914)
Prepaid expenses and other current assets	(8,714)		(6,023)
Other assets	4,469		6,607
Income taxes, net	(59,377)		(58,084)
Accounts payable	2,743		(422)
Accrued expenses and other current liabilities	35,007		6,508
Deferred revenues	18,251		61,078
Other liabilities	(480)		1,105
Total changes in operating assets and liabilities, net of the effects of acquisitions	137,016		144,849
Net cash provided by operating activities	491,416		475,700
Investing Activities
Purchases of available-for-sale investments	(1,286,417)		(993,242)
Proceeds from sales of available-for-sale investments	872,924		375,349
Proceeds from maturities of available-for-sale investments	210,026		237,880
Purchases of property and equipment	(67,141)		(66,781)
Proceeds related to cost method investments	2,784		1,500
Purchases of cost method investments	(1,427)		(2,467)
Cash paid for acquisitions, net of cash acquired	(41,342)		(324,049)
Cash paid for licensing agreements and product related intangible assets	(9,727)		(4,494)
Net cash used in investing activities	(320,320)		(776,304)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	18,095		34,959
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	3,004		11,944
Stock repurchases, net	(1,500,998)		(101,036)
Cash paid for tax withholding on vested stock awards	(22,840)		(24,804)
Other	0		912
Net cash used in financing activities	(173,301)		(78,025)
Effect of exchange rate changes on cash and cash equivalents	867		(1,827)
Change in cash and cash equivalents	(1,338)		(380,456)
Cash and cash equivalents at beginning of period	280,740		643,609
Cash and cash equivalents at end of period	$ 279,402		$ 263,153

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