Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 559,197	$ 231,866
Marketable securities (including restricted securities of $272 at December 31, 2010)	290,029	375,005
Accounts receivable, net of reserves of $4,555 and $5,232 at December 31, 2011 and 2010, respectively	210,936	175,366
Prepaid expenses and other current assets	55,414	48,029
Deferred income tax assets	6,444	28,201
Total current assets	1,122,020	858,467
Property and equipment, net	293,043	255,929
Marketable securities (including restricted securities of $42 and $45 at December 31, 2011 and 2010, respectively)	380,729	636,531
Goodwill	452,914	452,914
Other intangible assets, net	45,386	62,456
Deferred income tax assets	43,485	75,226
Other assets	7,924	11,153
Total assets	2,345,501	2,352,676
Current liabilities:
Accounts payable	38,247	26,375
Accrued expenses and other current liabilities	85,371	94,661
Deferred revenue	21,344	23,808
Accrued restructuring	3,430	307
Total current liabilities	148,392	145,151
Deferred revenue	2,470	3,642
Other liabilities	38,389	26,278
Total liabilities	189,251	175,071
Commitments, contingencies and guarantees (Note 11)
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; 195,561,243 shares issued and 177,504,624 shares outstanding at December 31, 2011; 192,383,121 shares issued and 186,603,380 shares outstanding at December 31, 2010	1,959	1,924
Additional paid-in capital	5,068,235	4,970,278
Treasury stock, at cost, 18,056,619 shares at December 31, 2011 and 5,779,741 shares at December 31, 2010	(482,994)	(158,261)
Accumulated other comprehensive loss	(1,259)	(5,741)
Accumulated deficit	(2,429,691)	(2,630,595)
Total stockholders' equity	2,156,250	2,177,605
Total liabilities and stockholders' equity	$ 2,345,501	$ 2,352,676