Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating Activities
Net income	$ 339,523		$ 352,547		$ 355,630
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	139,541	[1]	114,574	[1]	71,131	[1]
Depreciation and amortization of property and equipment	127,959		100,299		88,124
Stock-based compensation expense	183,941		149,940		92,909
(Gain) loss on investments	(2,441)		(14,477)		1,343
Provision for doubtful accounts	1,046		1,784		266
Provision for product returns	4,473		10,743		5,541
Provision for inventory reserves	1,905		1,022		1,570
Deferred income tax benefit	(51,848)		(70,791)		(16,229)
Excess tax benefit from stock-based compensation, net	8,129		24,839		50,003
Tax effect of stock-based compensation	(12,552)		(35,374)		(51,659)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	5,888		1,706		1,895
Other non-cash items	434		1,178		4,733
Total adjustments to reconcile net income to net cash provided by operating activities	406,475		285,443		249,627
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(22,951)		(107,628)		(95,481)
Inventories	(5,591)		(2,024)		(3,097)
Prepaid expenses and other current assets	(862)		(9,195)		1,407
Other assets	5,076		(1,497)		(562)
Income taxes, net	(35,316)		(4,408)		25,180
Accounts payable	3,092		(426)		(11,758)
Accrued expenses and other current liabilities	22,515		45,135		(20,996)
Deferred revenues	201,455		216,798		168,994
Other liabilities	14,927		43,782		10,178
Total changes in operating assets and liabilities, net of the effects of acquisitions	182,345		180,537		73,865
Net cash provided by operating activities	928,343		818,527		679,122
Investing Activities
Purchases of available-for-sale investments	(1,703,976)		(1,435,367)		(1,360,677)
Proceeds from sales of available-for-sale investments	766,192		1,256,295		856,182
Proceeds from maturities of available-for-sale investments	504,314		437,991		652,939
Proceeds from the sales of cost method investments	12,067		24,252		0
Purchases of property and equipment	(162,889)		(122,958)		(111,932)
Purchases of cost method investments	(6,824)		(6,622)		(16,879)
Cash paid for acquisitions, net of cash acquired	(334,881)		(487,221)		(455,377)
Cash paid for licensing agreements and product related intangible assets	(12,153)		(27,760)		(15,437)
Other	0		3,450		0
Net cash used in investing activities	(938,150)		(357,940)		(451,181)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	73,655		108,406		125,606
Repayment of acquired debt	(2,061)		(24,346)		(11,561)
Excess tax benefit from stock-based compensation	12,552		35,374		51,659
Purchase of non-controlling interest	0		0		(17,207)
Stock repurchases, net	(406,326)		(251,008)		(424,849)
Cash paid for tax withholding on vested stock awards	(31,013)		(20,170)		(13,262)
Other	912		1,962		(3,000)
Net cash used in financing activities	(352,281)		(149,782)		(292,614)
Effect of exchange rate changes on cash and cash equivalents	(781)		(492)		1,807
Change in cash and cash equivalents	(362,869)		310,313		(62,866)
Cash and cash equivalents at beginning of period	643,609		333,296		396,162
Cash and cash equivalents at end of period	280,740		643,609		333,296
Supplemental Cash Flow Information
Cash paid for income taxes	92,672		32,355		12,195
Cash paid for interest	$ 127		$ 305		$ 139

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