Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Operating Activities
Net income	$ 124,149		$ 160,273
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	69,987	[1]	49,296	[1]
Depreciation and amortization of property and equipment	60,499		46,049
Stock-based compensation expense	91,413		68,819
Gain on investments	(1,032)		(6,885)
Provision for doubtful accounts	1,066		386
Provision for product returns	3,056		6,437
Provision for inventory reserves	638		903
Tax effect of stock-based compensation	(29,263)		(23,979)
Excess tax benefit from exercise of stock options	25,908		23,078
Deferred income tax benefit	(39,371)		(31,883)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	2,936		186
Other non-cash items	220		548
Total adjustments to reconcile net income to net cash provided by operating activities	186,057		132,955
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	137,994		70,899
Inventories	(3,914)		945
Prepaid expenses and other current assets	(17,393)		(31,758)
Other assets	6,607		(814)
Income taxes, net	(49,460)		2,079
Accounts payable	(422)		3,155
Accrued expenses and other current liabilities	6,508		5,008
Deferred revenues	61,078		68,480
Other liabilities	7,177		(408)
Total changes in operating assets and liabilities, net of the effects of acquisitions	148,175		117,586
Net cash provided by operating activities	458,381		410,814
Investing Activities
Purchases of available-for-sale investments	(993,242)		(550,002)
Proceeds from sales of available-for-sale investments	375,349		702,711
Proceeds from maturities of available-for-sale investments	237,880		245,133
Purchases of property and equipment	(66,781)		(51,247)
Proceeds from the sales of cost method investments	1,500		6,475
Purchases of cost method investments	(2,467)		(2,547)
Cash paid for acquisitions, net of cash acquired	(324,049)		(82,378)
Cash paid for licensing agreements and product related intangible assets	(4,494)		(12,000)
Net cash (used in) provided by investing activities	(776,304)		256,145
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	34,959		61,489
Repayment of acquired debt	0		(7,737)
Excess tax benefit from exercise of stock options	29,263		23,979
Stock repurchases, net	(101,036)		(99,996)
Cash paid for tax withholding on vested stock awards	(24,804)		(15,062)
Other	912		1,050
Net cash used in financing activities	(60,706)		(36,277)
Effect of exchange rate changes on cash and cash equivalents	(1,827)		(2,138)
Change in cash and cash equivalents	(380,456)		628,544
Cash and cash equivalents at beginning of period	643,609		333,296
Cash and cash equivalents at end of period	$ 263,153		$ 961,840

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