Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 527,594	$ 260,149
Short-term investments, available-for-sale	545,206	529,260
Accounts receivable, net of allowances of $6,417 and $5,976 at September 30, 2015 and December 31, 2014, respectively	467,815	674,401
Inventories, net	10,863	12,617
Prepaid expenses and other current assets	141,742	166,005
Current portion of deferred tax assets, net	43,918	45,892
Total current assets	1,737,138	1,688,324
Long-term investments, available-for-sale	792,262	1,073,110
Property and equipment, net	371,101	367,779
Goodwill	1,957,436	1,796,851
Other intangible assets, net	366,048	390,717
Long-term portion of deferred tax assets, net	113,184	128,198
Other assets	68,314	67,028
Total assets	5,405,483	5,512,007
Current liabilities:
Accounts payable	143,299	79,884
Accrued expenses and other current liabilities	263,840	298,079
Income taxes payable	2,575	12,053
Current portion of deferred revenues	1,137,828	1,200,093
Total current liabilities	1,547,542	1,590,109
Long-term portion of deferred revenues	372,052	357,771
Convertible notes	1,316,892	1,292,953
Other liabilities	$ 84,305	$ 97,529
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; 298,112 and 294,674 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	298	295
Additional paid-in capital	4,492,313	4,292,706
Retained earnings	3,343,352	3,155,264
Accumulated other comprehensive loss	(29,464)	(36,790)
Stockholders' equity before treasury stock	7,806,499	7,411,475
Less - common stock in treasury, at cost (140,987 and 133,898 shares at September 30, 2015 and December 31, 2014, respectively)	(5,721,807)	(5,237,830)
Total stockholders' equity	2,084,692	2,173,645
Total liabilities and stockholders' equity	$ 5,405,483	$ 5,512,007