Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 643,609	$ 333,296
Short-term investments — available-for-sale	285,022	406,461
Accounts receivable, net of allowances of $6,448 and $3,925 at December 31, 2012 and 2011, respectively	630,956	484,431
Inventories, net	10,723	8,507
Prepaid expenses and other current assets	106,579	95,419
Current portion of deferred tax assets, net	36,846	44,916
Total current assets	1,713,735	1,373,030
Long-term investments — available-for-sale	595,313	737,844
Property and equipment, net	303,294	277,429
Goodwill	1,518,219	1,239,120
Other intangible assets, net	556,205	343,372
Long-term portion of deferred tax assets, net	43,097	67,479
Other assets	66,539	61,267
Total assets	4,796,402	4,099,541
Current liabilities:
Accounts payable	71,116	58,034
Accrued expenses and other current liabilities	256,259	214,836
Income taxes payable	49,346	8,300
Current portion of deferred tax liabilities, net	876	79,318
Current portion of deferred tax liabilities, net	965,276	818,642
Total current liabilities	1,342,873	1,179,130
Long-term portion of deferred revenues	232,719	141,241
Other liabilities	99,033	48,680
Commitments and contingencies
Stockholders' equity:
Preferred stock at $.01 par value: 5,000 shares authorized, none issued and outstanding	0	0
Common stock at $.001 par value: 1,000,000 shares authorized; 287,123 and 282,774 shares issued and outstanding at December 31, 2012 and 2011, respectively	287	283
Additional paid-in capital	3,691,111	3,385,053
Retained earnings	2,564,018	2,211,471
Accumulated other comprehensive loss	(7,705)	(11,561)
Stockholders' equity total before treasury stock	6,247,711	5,585,246
Less — common stock in treasury, at cost (100,781 and 96,960 shares at December 31, 2012 and 2011, respectively)	(3,125,934)	(2,854,756)
Total stockholders' equity	3,121,777	2,730,490	[1]
Total liabilities and stockholders' equity	$ 4,796,402	$ 4,099,541

[1] Amounts do not sum due to rounding.