Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,205,182	$ 1,115,130
Short-term investments, available-for-sale	628,696	632,516
Accounts receivable, net of allowances of $5,106 and $4,645 at September 30, 2018 and December 31, 2017, respectively	413,509	712,535
Inventories, net	21,386	13,912
Prepaid expenses and other current assets	229,188	147,330
Total current assets	2,497,961	2,621,423
Long-term investments, available-for-sale	657,727	984,328
Property and equipment, net	247,544	252,932
Goodwill	1,661,264	1,614,494
Other intangible assets, net	128,297	141,952
Deferred tax assets, net	127,703	152,362
Other assets	116,031	52,685
Total assets	5,436,527	5,820,176
Current liabilities:
Accounts payable	71,110	66,893
Accrued expenses and other current liabilities	293,883	277,679
Income taxes payable	29,918	34,033
Current portion of convertible notes	1,415,970	0
Current portion of deferred revenues	1,212,280	1,308,474
Total current liabilities	3,023,161	1,687,079
Long-term portion of deferred revenues	467,722	555,769
Long-term debt	741,551	2,127,474
Long-term income taxes payable	286,695	335,457
Other liabilities	144,892	121,936
Commitments and contingencies
Temporary equity from convertible notes	19,286	0
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; 307,981 and 305,751 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	308	306
Additional paid-in capital	5,193,928	4,883,670
Retained earnings	4,052,211	3,509,484
Accumulated other comprehensive loss	(18,291)	(10,806)
Stockholders' equity before treasury stock	9,228,156	8,382,654
Less - common stock in treasury, at cost (173,322 and 162,044 shares at September 30, 2018 and December 31, 2017, respectively)	(8,474,936)	(7,390,193)
Total stockholders' equity	753,220	992,461
Total liabilities, temporary equity and stockholders' equity	$ 5,436,527	$ 5,820,176