Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents (including restricted cash of $200 at December 31, 2012)	$ 201,989	$ 559,197
Marketable securities (including restricted securities of $57 at December 31, 2012)	235,592	290,029
Accounts receivable, net of reserves of $3,807 and $4,555 at December 31, 2012 and 2011, respectively	218,777	210,936
Prepaid expenses and other current assets	51,604	55,414
Deferred income tax assets	20,422	6,444
Total current assets	728,384	1,122,020
Property and equipment, net	345,091	293,043
Marketable securities (including restricted securities of $43 and $42 at December 31, 2012 and 2011, respectively)	657,659	380,729
Goodwill	731,325	452,914
Other intangible assets, net	84,554	45,386
Deferred income tax assets	13,803	43,485
Other assets	39,811	7,924
Total assets	2,600,627	2,345,501
Current liabilities:
Accounts payable	43,291	38,247
Accrued expenses and other current liabilities	133,087	85,371
Deferred revenue	26,291	21,344
Accrued restructuring	275	3,430
Total current liabilities	202,944	148,392
Deferred revenue	2,565	2,470
Other liabilities	49,364	38,389
Total liabilities	254,873	189,251
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; 200,199,536 shares issued and 177,782,814 shares outstanding at December 31, 2012; 195,561,243 shares issued and 177,504,624 shares outstanding at December 31, 2011	2,015	1,959
Additional paid-in capital	5,195,543	5,068,235
Treasury stock, at cost, 22,416,722 shares at December 31, 2012 and 18,056,619 shares at December 31, 2011	(624,462)	(482,994)
Accumulated other comprehensive loss	(1,640)	(1,259)
Accumulated deficit	(2,225,702)	(2,429,691)
Total stockholders’ equity	2,345,754	2,156,250
Total liabilities and stockholders’ equity	$ 2,600,627	$ 2,345,501