Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 355,599	$ 231,866
Marketable securities (including restricted securities of $51 and $272 at September 30, 2011 and December 31, 2010, respectively)	331,967	375,005
Accounts receivable, net of reserves of $5,676 and $5,232 at September 30, 2011 and December 31, 2010, respectively	182,665	175,366
Prepaid expenses and other current assets	47,085	48,029
Deferred income tax assets	7,163	28,201
Total current assets	924,479	858,467
Property and equipment, net	285,476	255,929
Marketable securities (including restricted securities of $45 at September 30, 2011 and December 31, 2010)	503,429	636,531
Goodwill	452,914	452,914
Other intangible assets, net	49,702	62,456
Deferred income tax assets	76,747	75,226
Other assets	9,210	11,153
Total assets	2,301,957	2,352,676
Current liabilities:
Accounts payable	30,349	26,375
Accrued expenses and other current liabilities	85,265	94,661
Deferred revenue	23,201	23,808
Accrued restructuring	63	307
Total current liabilities	138,878	145,151
Other liabilities	38,013	26,278
Deferred revenue	3,055	3,642
Total liabilities	179,946	175,071
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; 194,682,252 shares issued and 179,519,564 shares outstanding at September 30, 2011 and 192,383,121 shares issued and 186,603,380 shares outstanding at December 31, 2010	1,947	1,924
Additional paid-in capital	5,025,797	4,970,278
Accumulated other comprehensive income (loss)	(9,299)	(5,741)
Treasury stock, at cost, 15,162,688 shares at September 30, 2011 and 5,779,741 shares at December 31, 2010	(406,662)	(158,261)
Accumulated deficit	(2,489,772)	(2,630,595)
Total stockholders' equity	2,122,011	2,177,605
Total liabilities and stockholders' equity	$ 2,301,957	$ 2,352,676