Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income (loss)	$ (70,312)	$ (180,774)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	42,349	64,553
Stock-based expense	99,803	93,468
(Gain) loss from sales of investments, assets and other, net	(6,283)	2,131
Tax benefits from stock-based awards	90
Excess tax benefits from stock-based awards	(90)
Accretion and amortization on marketable securities	4,941	7,783
Deferred income taxes	(9,151)	(10,113)
Changes in operating assets and liabilities:
Accounts receivable, net	2,544	(13,443)
Income tax receivable	(1,712)	3,200
Other assets	(11,860)	(3,860)
Accounts payable	12,226	(5,919)
Deferred revenue	(61,097)	13,838
Other liabilities	(49,360)	20,280
Net cash provided by (used in) operating activities	(47,912)	(8,856)
Investing activities:
Purchases of marketable securities	(101,091)	(617,256)
Sales and maturities of marketable securities	702,017	667,706
Acquisition of property and equipment	(6,847)	(7,078)
Business acquisition, net of cash acquired	(20,023)	(391,711)
Proceeds from sale of property and equipment	750	5,059
Proceeds from sale of equity method investment	10,507
Other investing activities, net		357
Net cash provided by (used in) investing activities	585,313	(342,923)
Financing activities:
Taxes paid related to net share settlement of equity awards	(1,866)	(963)
Proceeds from employee stock purchase plan and exercise of stock options	7,292	15,728
Excess tax benefits from stock-based awards	90
Acquisition related contingent consideration payment	(10,790)
Net cash provided by (used in) financing activities	(5,274)	14,765
Effect of exchange rate changes on cash and cash equivalents	(410)	(231)
Net increase (decrease) in cash and cash equivalents	531,717	(337,245)
Cash and cash equivalents, beginning of period	131,303	465,523
Cash and cash equivalents, end of period	$ 663,020	$ 128,278