Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Operating Activities
Net income	$ 251,723		$ 339,523		$ 352,547
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	192,325	[1]	139,541	[1]	114,574	[1]
Depreciation and amortization of property and equipment	137,945		127,959		100,299
Amortization of debt discount and transaction costs	23,293		0		0
Stock-based compensation expense	169,287		183,941		149,940
Loss (gain) on investments	1,124		(2,441)		(14,477)
Provision for doubtful accounts	2,861		1,046		1,784
Provision for product returns	5,049		4,473		10,743
Provision for inventory reserves	2,656		1,905		1,022
Deferred income tax benefit	(36,982)		(51,848)		(70,791)
Excess tax benefit from stock-based compensation, net	(6,132)		(12,552)		(35,374)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	5,233		5,888		1,706
Other non-cash items	729		434		1,178
Total adjustments to reconcile net income to net cash provided by operating activities	497,388		398,346		260,604
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(30,962)		(22,951)		(107,628)
Inventories	(1,167)		(5,591)		(2,024)
Prepaid expenses and other current assets	(8,133)		(7,928)		(16,606)
Other assets	1,498		5,076		(1,497)
Income taxes, net	(79,119)		(7,374)		71,255
Accounts payable	40		3,092		(426)
Accrued expenses and other current liabilities	62,195		23,028		45,135
Deferred revenues	146,123		201,455		216,798
Other liabilities	6,395		1,667		369
Total changes in operating assets and liabilities, net of the effects of acquisitions	96,870		190,474		205,376
Net cash provided by operating activities	845,981		928,343		818,527
Investing Activities
Purchases of available-for-sale investments	(2,390,950)		(1,703,976)		(1,435,367)
Proceeds from sales of available-for-sale investments	1,694,886		766,192		1,256,295
Proceeds from maturities of available-for-sale investments	406,334		504,314		437,991
Proceeds related to cost method investments	4,049		12,067		24,252
Purchases of property and equipment	(165,417)		(162,889)		(122,958)
Purchases of cost method investments	(3,624)		(6,824)		(6,622)
Cash paid for acquisitions, net of cash acquired	(101,059)		(334,881)		(487,221)
Cash paid for licensing agreements and product related intangible assets	(13,676)		(12,153)		(27,760)
Other	0		0		3,450
Net cash used in investing activities	(569,457)		(938,150)		(357,940)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	46,618		73,655		108,406
Proceeds from issuance of convertible notes, net of issuance costs	1,415,717		0		0
Purchase of convertible note hedges	(184,288)		0		0
Proceeds from issuance of warrants	101,775		0		0
Repayment of acquired debt	(4,065)		(2,061)		(24,346)
Excess tax benefit from stock-based compensation	6,132		12,552		35,374
Stock repurchases, net	(1,640,885)		(406,326)		(251,008)
Cash paid for tax withholding on vested stock awards	(33,672)		(31,013)		(20,170)
Other	0		912		1,962
Net cash used in financing activities	(292,668)		(352,281)		(149,782)
Effect of exchange rate changes on cash and cash equivalents	(4,447)		(781)		(492)
Change in cash and cash equivalents	(20,591)		(362,869)		310,313
Cash and cash equivalents at beginning of period	280,740		643,609		333,296
Cash and cash equivalents at end of period	260,149		280,740		643,609
Supplemental Cash Flow Information
Cash paid for income taxes	130,502		92,672		32,355
Cash paid for interest	$ 5,027		$ 127		$ 305

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