Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating activities:
Net income (loss)	$ (11,740)	$ (160,887)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	96,905	108,049
Stock-based expense	65,066	267,124
(Gain) loss from sales of investments, assets and other, net	7,437	(161)
Net gain on termination of lease and purchase of building		(19,886)
Tax benefits from stock-based awards	(10,792)	5,680
Excess tax benefits from stock-based awards	10,792	(5,680)
Accretion and amortization on marketable securities	14,310	12,058
Deferred income taxes	(18,253)	(58,391)
Impairment of intangible assets	10,217	95,493
Changes in operating assets and liabilities:
Accounts receivable, net	39,902	35,064
Income tax receivable	(469)	11,819
Other assets	194	8,920
Accounts payable	(2,728)	(7,040)
Deferred revenue	(127,405)	(83,744)
Other liabilities	(52,494)	(32,430)
Net cash provided by (used in) operating activities	20,942	175,988
Investing activities:
Purchases of marketable securities	(821,942)	(1,527,322)
Sales of marketable securities	234,901	150,117
Maturities of marketable securities	699,418	441,698
Purchase of corporate headquarters building		(233,700)
Acquisition of property and equipment	(7,344)	(91,804)
Acquisition of purchased technology and other intangible assets		(3,193)
Business acquisition, net of cash acquired	(18,054)	(205,510)
Restricted cash	227	6,536
Other investing activities, net	228	937
Net cash provided by (used in) investing activities	87,434	(1,462,241)
Financing activities:
Proceeds from debt, net of issuance costs		99,780
Taxes paid related to net share settlement of equity awards	(1,031)	(26,069)
Repurchases of common stock	(9,302)
Proceeds from exercise of stock options	6,430	14,290
Proceeds from employee stock purchase plan	7,892	4,489
Excess tax benefits from stock-based awards	(10,792)	5,680
Repayment of debt	(100,000)
Net cash provided by (used in) financing activities	(106,803)	98,170
Effect of exchange rate changes on cash and cash equivalents	(804)	99
Net increase (decrease) in cash and cash equivalents	769	(1,187,984)
Cash and cash equivalents, beginning of period	385,949	1,582,343
Cash and cash equivalents, end of period	$ 386,718	$ 394,359