Condensed Consolidated Statements Of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Operating Activities
Net income	$ 28,887		$ 55,939
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of intangible assets	28,173	[1]	36,760	[1]
Depreciation and amortization of property and equipment	37,006		33,271
Amortization of debt discount and transaction costs	8,902		0
Stock-based compensation expense	34,211		40,701
Loss on investments	668		5,133
Provision for doubtful accounts	704		610
Provision for product returns	995		584
Provision for inventory	274		453
Excess tax benefit from stock-based compensation	(1,151)		(2,332)
Deferred income tax deficiency	19,013		18,046
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	10,007		(850)
Other non-cash items	849		39
Total adjustments to reconcile net income to net cash provided by operating activities	139,651		132,415
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	231,034		142,974
Inventories	319		1,117
Prepaid expenses and other current assets	(7,313)		(7,524)
Other assets	(9,185)		2,101
Income taxes, net	(18,954)		(46,030)
Accounts payable	1,883		(1,312)
Accrued expenses and other current liabilities	(34,405)		10,598
Deferred revenues	(41,840)		(938)
Other liabilities	1,794		(1,464)
Total changes in operating assets and liabilities, net of the effects of acquisitions	123,333		99,522
Net cash provided by operating activities	291,871		287,876
Investing Activities
Purchases of available-for-sale investments	(556,484)		(607,892)
Proceeds from sales of available-for-sale investments	432,908		266,421
Proceeds from maturities of available-for-sale investments	161,429		121,757
Purchases of property and equipment	(44,091)		(30,469)
Proceeds related to cost method investments	0		803
Purchases of cost method investments	(737)		(766)
Cash paid for acquisitions, net of cash acquired	(89,467)		(24,154)
Cash paid for licensing agreements and product related intangible assets	(2,082)		(711)
Net cash used in investing activities	(98,524)		(275,011)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	8,413		7,958
Proceeds from credit facility	95,000		0
Repayment of acquired debt	(3,175)		(3,766)
Excess tax benefit from stock-based compensation	1,151		2,332
Stock repurchases, net	(124,928)		0
Cash paid for tax withholding on vested stock awards	(19,394)		(2,316)
Net cash (used in) provide by financing activities	(42,933)		4,208
Effect of exchange rate changes on cash and cash equivalents	(7,630)		706
Change in cash and cash equivalents	142,784		17,779
Cash and cash equivalents at beginning of period	260,149		280,740
Cash and cash equivalents at end of period	$ 402,933		$ 298,519

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