Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 279,402	$ 280,740
Short-term investments, available-for-sale	540,996	453,976
Accounts receivable, net of allowances of $5,086 and $5,354 at June 30, 2014 and December 31, 2013, respectively	506,409	654,821
Inventories, net	14,206	14,107
Prepaid expenses and other current assets	152,755	110,981
Current portion of deferred tax assets, net	47,802	48,470
Total current assets	1,541,570	1,563,095
Long-term investments, available-for-sale	975,676	855,700
Property and equipment, net	339,832	338,996
Goodwill	1,790,035	1,768,949
Other intangible assets, net	445,643	509,595
Long-term portion of deferred tax assets, net	90,480	115,418
Other assets	65,980	60,496
Total assets	5,249,216	5,212,249
Current liabilities:
Accounts payable	79,621	78,452
Accrued expenses and other current liabilities	280,038	257,606
Income taxes payable	5,188	29,322
Current portion of deferred revenues	1,110,748	1,098,681
Total current liabilities	1,475,595	1,464,061
Long-term portion of deferred revenues	319,244	313,059
Convertible Debt, Noncurrent	1,277,289	0
Other liabilities	73,191	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; 293,200 and 291,078 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	293	291
Additional paid-in capital	3,896,459	3,974,297
Retained earnings	3,012,504	2,903,541
Accumulated other comprehensive income	1,752	4,951
Stockholders' equity before treasury stock	6,911,008	6,883,080
Less - common stock in treasury, at cost (129,055 and 107,789 shares at June 30, 2014 and December 31, 2013, respectively)	(4,807,111)	(3,563,273)
Total stockholders' equity	2,103,897	3,319,807
Total liabilities and equity	$ 5,249,216	$ 5,212,249