Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating Activities
Net income	$ 132,162	$ 108,963
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	150,960	174,575
Stock-based compensation expense	65,003	85,991
Excess tax benefit from stock-based compensation	(1,924)	(3,004)
Deferred income tax benefit	(5,554)	(12,399)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	9,318	(2,107)
Other non-cash items	8,335	7,077
Total adjustments to reconcile net income to net cash provided by operating activities	226,138	250,133
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	168,851	146,204
Inventories	(771)	(1,087)
Prepaid expenses and other current assets	(3,381)	(8,714)
Other assets	(6,023)	4,469
Income taxes, net	8,380	(64,073)
Accounts payable	38	2,743
Accrued expenses and other current liabilities	(20,082)	35,007
Deferred revenues	(18,319)	18,251
Other liabilities	6,025	(480)
Total changes in operating assets and liabilities, net of the effects of acquisitions	134,718	132,320
Net cash provided by operating activities	493,018	491,416
Investing Activities
Purchases of available-for-sale investments	(1,048,809)	(1,286,417)
Proceeds from sales of available-for-sale investments	834,578	872,924
Proceeds from maturities of available-for-sale investments	333,633	210,026
Purchases of property and equipment	(80,005)	(67,141)
(Purchases) proceeds from cost method investments, net	(1,058)	1,357
Cash paid for acquisitions, net of cash acquired	(251,184)	(41,342)
Cash paid for licensing agreements and product related intangible assets	(9,334)	(9,727)
Net cash used in investing activities	(222,179)	(320,320)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	43,419	18,095
Proceeds from issuance of convertible notes, net of issuance costs	0	1,415,717
Purchase of convertible note hedges	0	(184,288)
Proceeds from issuance of warrants	0	101,775
Proceeds from credit facility	95,000	0
Repayment of credit facility	(95,000)	0
Repayment of acquired debt	(7,569)	(3,766)
Excess tax benefit from stock-based compensation	1,924	3,004
Stock repurchases, net	(172,132)	(1,500,998)
Cash paid for tax withholding on vested stock awards	(28,321)	(22,840)
Net cash used in financing activities	(162,679)	(173,301)
Effect of exchange rate changes on cash and cash equivalents	(5,996)	867
Change in cash and cash equivalents	102,164	(1,338)
Cash and cash equivalents at beginning of period	260,149	280,740
Cash and cash equivalents at end of period	$ 362,313	$ 279,402