Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 182,996	$ 559,197
Marketable securities (including restricted securities of $53 at June 30, 2012)	313,564	290,029
Accounts receivable, net of reserves of $5,391 and $4,555 at June 30, 2012 and December 31, 2011, respectively	206,316	210,936
Prepaid expenses and other current assets	47,285	55,414
Deferred income tax assets	6,444	6,444
Total current assets	756,605	1,122,020
Property and equipment, net	315,866	293,043
Marketable securities (including restricted securities of $42 at June 30, 2012 and December 31, 2011, respectively)	521,885	380,729
Goodwill	709,668	452,914
Other intangible assets, net	84,056	45,386
Deferred income tax assets	43,182	43,485
Other assets	14,314	7,924
Total assets	2,445,576	2,345,501
Current liabilities:
Accounts payable	44,546	38,247
Accrued expenses and other current liabilities	94,608	85,371
Deferred revenue	26,072	21,344
Accrued restructuring	626	3,430
Total current liabilities	165,852	148,392
Other liabilities	63,249	38,389
Deferred revenue	1,842	2,470
Total liabilities	230,943	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; 198,334,880 shares issued and 177,871,256 shares outstanding at June 30, 2012 and 195,561,243 shares issued and 177,504,624 shares outstanding at December 31, 2011	1,993	1,959
Additional paid-in capital	5,117,093	5,068,235
Accumulated other comprehensive loss	(4,108)	(1,259)
Treasury stock, at cost, 20,463,624 shares at June 30, 2012 and 18,056,619 shares at December 31, 2011	(558,120)	(482,994)
Accumulated deficit	(2,342,225)	(2,429,691)
Total stockholders' equity	2,214,633	2,156,250
Total liabilities and stockholders' equity	$ 2,445,576	$ 2,345,501