Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Operating Activities
Net income	$ 355,630		$ 276,441		$ 191,017
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	71,131	[1]	64,783	[1]	68,889	[1]
Depreciation and amortization of property and equipment	88,124		73,375		69,688
Stock-based compensation expense	92,909		103,758		111,419
Loss (gain) on available-for-sale investments	1,343		2,014		(67)
Provision for doubtful accounts	266		2,035		1,734
Provision for product returns	5,541		2,717		3,292
Provision for inventory reserves	1,570		2,876		1,961
Deferred tax benefit	(16,229)		(46,676)		(50,850)
Tax effect of stock-based compensation	50,003		51,544		(7,913)
Excess tax benefit from exercise of stock options	(51,659)		(60,164)		(5,182)
Goodwill adjustment	0		0		5,393
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	1,895		(1,984)		2,019
Other non-cash items	4,733		781		4,988
Total adjustments to reconcile net income to net cash provided by operating activities	249,627		195,059		205,371
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(95,481)		(79,058)		(74,604)
Inventories	(3,097)		(1,192)		601
Prepaid expenses and other current assets	1,407		(37,319)		(3,055)
Other assets	(562)		3,785		(487)
Deferred tax assets, net	(2,744)		6,270		10,470
Accounts payable	(11,758)		9,612		4,613
Accrued expenses and other current liabilities	(13,319)		81,169		62,900
Deferred revenues	168,994		160,121		85,373
Other liabilities	30,425		1,404		1,775
Total changes in operating assets and liabilities, net of the effects of acquisitions	73,865		144,792		87,586
Net cash provided by operating activities	679,122		616,292		483,974
Investing Activities
Purchases of available for-sale investments	(1,360,677)		(1,287,438)		(1,134,580)
Proceeds from sales of available-for-sale investments	856,182		474,130		436,223
Proceeds from maturities of available-for-sale investments	652,939		433,792		284,916
Proceeds from repayments of trading securities	0		44,560		700
Purchases of property and equipment	(111,932)		(75,376)		(76,246)
Purchases of cost method investments	(16,879)		(9,485)		(7,250)
Cash paid for acquisitions, net of cash acquired	(455,377)		(20,510)		(3,338)
Cash paid for licensing agreements and product related intangible assets	(15,437)		(16,715)		(3,290)
Net cash used in investing activities	(451,181)		(457,042)		(502,865)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	125,606		353,557		165,998
Repayment of acquired debt	(11,561)		0		0
Excess tax benefit from exercise of stock options	51,659		60,164		5,182
Purchase of non-controlling interest	(17,207)		0		0
Stock repurchases, net	(424,849)		(433,739)		(214,944)
Cash paid for tax withholding on vested stock awards	(13,262)		(6,298)		(1,773)
Other	(3,000)		0		0
Net cash (used in) provided by financing activities	(292,614)		(26,316)		(45,537)
Effect of exchange rate changes on cash and cash equivalents	1,807		1,785		(250)
Change in cash and cash equivalents	(62,866)		134,719		(64,678)
Cash and cash equivalents at beginning of period	396,162		261,443		326,121
Cash and cash equivalents at end of period	333,296		396,162		261,443
Supplemental Cash Flow Information
Cash paid for income taxes	12,195		42,902		31,367
Cash paid for interest	$ 139		$ 276		$ 211

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