Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 182,650	$ 559,197
Marketable securities (including restricted securities of $54 at September 30, 2012)	282,579	290,029
Accounts receivable, net of reserves of $5,778 and $4,555 at September 30, 2012 and December 31, 2011, respectively	236,232	210,936
Prepaid expenses and other current assets	45,784	55,414
Deferred income tax assets	6,444	6,444
Total current assets	753,689	1,122,020
Property and equipment, net	331,218	293,043
Marketable securities (including restricted securities of $44 at September 30, 2012 and $42 at December 31, 2011, respectively)	593,105	380,729
Goodwill	721,601	452,914
Other intangible assets, net	82,375	45,386
Deferred income tax assets	42,101	43,485
Other assets	15,365	7,924
Total assets	2,539,454	2,345,501
Current liabilities:
Accounts payable	52,749	38,247
Accrued expenses and other current liabilities	131,616	85,371
Deferred revenue	27,927	21,344
Accrued restructuring	628	3,430
Total current liabilities	212,920	148,392
Other liabilities	64,499	38,389
Deferred revenue	2,097	2,470
Total liabilities	279,516	189,251
Commitments, contingencies and guarantees (Note 15)
Stockholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; 700,000 shares designated as Series A Junior Participating Preferred Stock; no shares issued or outstanding	0	0
Common stock, $0.01 par value; 700,000,000 shares authorized; 198,954,802 shares issued and 177,331,901 shares outstanding at September 30, 2012 and 195,561,243 shares issued and 177,504,624 shares outstanding at December 31, 2011	2,000	1,959
Additional paid-in capital	5,146,092	5,068,235
Accumulated other comprehensive income (loss)	483	(1,259)
Treasury stock, at cost, 21,622,106 shares at September 30, 2012 and 18,056,619 shares at December 31, 2011	(594,643)	(482,994)
Accumulated deficit	(2,293,994)	(2,429,691)
Total stockholders' equity	2,259,938	2,156,250
Total liabilities and stockholders' equity	$ 2,539,454	$ 2,345,501