Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Operating Activities
Net income	$ 200,879		$ 238,518
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	104,703	[1]	82,064	[1]
Depreciation and amortization of property and equipment	93,939		71,991
Stock-based compensation expense	137,306		108,922
Gain on investments	(2,298)		(13,378)
Provision for doubtful accounts	1,267		829
Provision for product returns	3,471		8,703
Provision for inventory reserves	1,529		923
Tax effect of stock-based compensation	24,421		30,380
Excess tax benefit from exercise of stock options	(33,605)		(31,976)
Deferred income tax benefit	(50,538)		(32,023)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	3,181		(882)
Other non-cash items	374		981
Total adjustments to reconcile net income to net cash provided by operating activities	283,750		226,534
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	182,039		70,485
Inventories	(3,088)		(2,163)
Prepaid expenses and other current assets	(21,663)		(27,114)
Other assets	4,841		2,392
Income taxes, net	(44,570)		(4,393)
Accounts payable	(4,949)		(7,051)
Accrued expenses and other current liabilities	10,783		22,051
Deferred revenues	59,891		72,816
Other liabilities	13,416		(269)
Total changes in operating assets and liabilities, net of the effects of acquisitions	196,700		126,754
Net cash provided by operating activities	681,329		591,806
Investing Activities
Purchases of available-for-sale investments	(1,427,698)		(1,189,868)
Proceeds from sales of available-for-sale investments	486,822		891,008
Proceeds from maturities of available-for-sale investments	409,556		356,893
Purchases of property and equipment	(126,610)		(87,290)
Proceeds from the sales of cost method investments	2,811		21,413
Purchases of cost method investments	(5,095)		(5,149)
Cash paid for acquisitions, net of cash acquired	(329,343)		(488,347)
Cash paid for licensing agreements and product related intangible assets	(7,202)		(14,277)
Other	0		3,450
Net cash used in investing activities	(996,759)		(512,167)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	68,570		95,796
Repayment of acquired debt	0		(24,346)
Excess tax benefit from exercise of stock options	33,605		31,976
Stock repurchases, net	(156,334)		(174,951)
Cash paid for tax withholding on vested stock awards	(27,708)		(17,524)
Other	912		1,050
Net cash used in financing activities	(80,955)		(87,999)
Effect of exchange rate changes on cash and cash equivalents	(751)		(809)
Change in cash and cash equivalents	(397,136)		(9,169)
Cash and cash equivalents at beginning of period	643,609		333,296
Cash and cash equivalents at end of period	$ 246,473		$ 324,127

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