Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities
Net income	$ 188,087	$ 156,495
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	295,810	251,320
Stock-based compensation expense	103,674	128,440
Excess tax benefit from stock-based compensation	(2,236)	(5,122)
Deferred income tax benefit	(31,873)	(25,114)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	13,382	825
Other non-cash items	11,155	9,722
Total adjustments to reconcile net income to net cash provided by operating activities	389,912	360,071
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	198,075	182,542
Inventories	1,084	(4,342)
Prepaid expenses and other current assets	(7,375)	(5,763)
Other assets	(1,460)	1,651
Income taxes, net	21,088	(87,180)
Accounts payable	6,658	7,526
Accrued expenses and other current liabilities	(674)	53,846
Deferred revenues	(47,982)	(8,183)
Other liabilities	5,400	(1,113)
Total changes in operating assets and liabilities, net of the effects of acquisitions	174,814	138,984
Net cash provided by operating activities	752,813	655,550
Investing Activities
Purchases of available-for-sale investments	(1,806,781)	(1,891,045)
Proceeds from sales of available-for-sale investments	1,552,983	1,342,500
Proceeds from maturities of available-for-sale investments	518,755	282,711
Purchases of property and equipment	(119,591)	(115,442)
(Purchases) proceeds from cost method investments, net	(3,400)	1,084
Cash paid for acquisitions, net of cash acquired	(250,986)	(43,342)
Cash paid for licensing agreements and product related intangible assets	(10,666)	(12,712)
Net cash used in investing activities	(119,686)	(436,246)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	79,338	38,674
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	2,236	5,122
Stock repurchases, net	(398,070)	(1,600,986)
Cash paid for tax withholding on vested stock awards	(32,351)	(27,777)
Net cash used in financing activities	(356,416)	(255,529)
Effect of exchange rate changes on cash and cash equivalents	(9,266)	(1,728)
Change in cash and cash equivalents	267,445	(37,953)
Cash and cash equivalents at beginning of period	260,149	280,740
Cash and cash equivalents at end of period	$ 527,594	$ 242,787