Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Operating Activities
Net income	$ 160,273		$ 154,755
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	49,296	[1]	32,687	[1]
Depreciation and amortization of property and equipment	46,049		40,018
Stock-based compensation expense	68,819		38,637
(Gain) Loss on investments	(6,885)		655
Provision for doubtful accounts	386		(669)
Provision for product returns	6,437		2,222
Provision for inventory reserves	903		1,171
Tax effect of stock-based compensation	23,078		37,247
Excess tax benefit from exercise of stock options	(23,979)		(37,269)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	186		(2,347)
Other non-cash items	548		1,193
Total adjustments to reconcile net income to net cash provided by operating activities	164,838		113,545
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	70,899		44,405
Inventories	945		(1,522)
Prepaid expenses and other current assets	(31,758)		(18,469)
Other assets	(814)		497
Deferred tax assets, net	14,920		(13,036)
Accounts payable	3,155		(8,938)
Accrued expenses and other current liabilities	5,008		(28,082)
Deferred revenues	68,480		43,288
Deferred tax liabilities, net	(44,724)		25,093
Other liabilities	(408)		9,989
Total changes in operating assets and liabilities, net of the effects of acquisitions	85,703		53,225
Net cash provided by operating activities	410,814		321,525
Investing Activities
Purchases of available for-sale investments	(550,002)		(684,332)
Proceeds from sales of available-for-sale investments	702,711		395,709
Proceeds from maturities of available-for-sale investments	245,133		312,007
Purchases of property and equipment	(51,247)		(59,456)
Proceeds from the sale of cost method investments	6,475		0
Purchases of cost method investments	(2,547)		(8,222)
Cash paid for acquisitions, net of cash acquired	(82,378)		(118,440)
Cash paid for licensing agreements and product related intangible assets	(12,000)		(7,487)
Net cash (used in) provided by investing activities	256,145		(170,221)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	61,489		85,126
Repayment of acquired debt	(7,737)		(10,926)
Excess tax benefit from exercise of stock options	23,979		37,269
Purchase of non-controlling interest	0		(17,207)
Stock repurchases, net	(99,996)		(199,915)
Cash paid for tax withholding on vested stock awards	(15,062)		(12,052)
Other	1,050		(3,000)
Net cash used in financing activities	(36,277)		(120,705)
Effect of exchange rate changes on cash and cash equivalents	(2,138)		4,055
Change in cash and cash equivalents	628,544		34,654
Cash and cash equivalents at beginning of period	333,296		396,162
Cash and cash equivalents at end of period	$ 961,840		$ 430,816

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