Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 242,787	$ 280,740
Short-term investments, available-for-sale	504,436	453,976
Accounts receivable, net of allowances of $4,954 and $5,354 at September 30, 2014 and December 31, 2013, respectively	465,558	654,821
Inventories, net	16,483	14,107
Prepaid expenses and other current assets	164,877	110,981
Current portion of deferred tax assets, net	50,569	48,470
Total current assets	1,444,710	1,563,095
Long-term investments, available-for-sale	1,073,232	855,700
Property and equipment, net	353,720	338,996
Goodwill	1,782,645	1,768,949
Other intangible assets, net	414,751	509,595
Long-term portion of deferred tax assets, net	94,021	115,418
Other assets	68,398	60,496
Total assets	5,231,477	5,212,249
Current liabilities:
Accounts payable	85,802	78,452
Accrued expenses and other current liabilities	286,689	257,606
Income taxes payable	2,497	29,322
Current portion of deferred revenues	1,087,459	1,098,681
Total current liabilities	1,462,447	1,464,061
Long-term portion of deferred revenues	316,097	313,059
Convertible notes	1,285,092	0
Other liabilities	71,503	115,322
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; 294,141 and 291,078 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	294	291
Additional paid-in capital	3,968,544	3,974,297
Retained earnings	3,060,036	2,903,541
Accumulated other comprehensive (loss) income	(20,499)	4,951
Stockholders' equity before treasury stock	7,008,375	6,883,080
Less - common stock in treasury, at cost (130,566 and 107,789 shares at September 30, 2014 and December 31, 2013, respectively)	(4,912,037)	(3,563,273)
Total stockholders' equity	2,096,338	3,319,807
Total liabilities and equity	$ 5,231,477	$ 5,212,249