Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 280,740	$ 643,609
Short-term investments, available-for-sale	453,976	285,022
Accounts receivable, net of allowances of $5,354 and $6,448 at December 31, 2013 and 2012, respectively	654,821	630,956
Inventories, net	14,107	10,723
Prepaid expenses and other current assets	110,981	106,579
Current portion of deferred tax assets, net	48,470	36,846
Total current assets	1,563,095	1,713,735
Long-term investments, available-for-sale	855,700	595,313
Property and equipment, net	338,996	303,294
Goodwill	1,768,949	1,518,219
Other intangible assets, net	509,595	556,205
Long-term portion of deferred tax assets, net	115,418	43,097
Other assets	60,496	66,539
Total assets	5,212,249	4,796,402
Current liabilities:
Accounts payable	78,452	71,116
Accrued expenses and other current liabilities	257,606	257,135
Income taxes payable	29,322	49,346
Current portion of deferred revenues	1,098,681	965,276
Total current liabilities	1,464,061	1,342,873
Long-term portion of deferred revenues	313,059	232,719
Other liabilities	115,322	99,033
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; 291,078 and 287,123 shares issued and outstanding at December 31, 2013 and 2012, respectively	291	287
Additional paid-in capital	3,974,297	3,691,111
Retained earnings	2,903,541	2,564,018
Accumulated other comprehensive income (loss)	4,951	(7,705)
Stockholders' equity before treasury stock	6,883,080	6,247,711
Less - common stock in treasury, at cost (107,789 and 100,781 shares at December 31, 2013 and 2012, respectively)	(3,563,273)	(3,125,934)
Total stockholders' equity	3,319,807	3,121,777
Total liabilities and stockholders' equity	$ 5,212,249	$ 4,796,402