Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 205,629	$ 231,866
Marketable securities (including restricted securities of $51 and $272 at June 30, 2011 and December 31, 2010, respectively)	291,647	375,005
Accounts receivable, net of reserves of $4,914 and $5,232 at June 30, 2011 and December 31, 2010, respectively	178,260	175,366
Prepaid expenses and other current assets	47,348	48,029
Deferred income tax assets	28,069	28,201
Total current assets	750,953	858,467
Property and equipment, net	274,377	255,929
Marketable securities (including restricted securities of $45 at June 30, 2011 and December 31, 2010)	788,197	636,531
Goodwill	452,914	452,914
Other intangible assets, net	53,887	62,456
Deferred income tax assets	74,281	75,226
Other assets	9,540	11,153
Total assets	2,404,149	2,352,676
Current liabilities:
Accounts payable	29,053	26,375
Accrued expenses and other current liabilities	86,909	94,661
Deferred revenue	22,412	23,808
Accrued restructuring	334	307
Total current liabilities	138,708	145,151
Other liabilities	33,693	26,278
Deferred revenue	3,433	3,642
Total liabilities	175,834	175,071
Commitments, contingencies and guarantees (Note 14)
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; 194,324,558 shares issued and 185,981,780 shares outstanding at June 30, 2011 and 192,383,121 shares issued and 186,603,380 outstanding at December 31, 2010	1,944	1,924
Additional paid-in capital	5,009,667	4,970,278
Accumulated other comprehensive income (loss)	298	(5,741)
Treasury stock, at cost, 8,342,778 shares at June 30, 2011 and 5,779,741 shares at December 31, 2010	(251,537)	(158,261)
Accumulated deficit	(2,532,057)	(2,630,595)
Total stockholders' equity	2,228,315	2,177,605
Total liabilities and stockholders' equity	$ 2,404,149	$ 2,352,676