Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 844,771	$ 836,095
Short-term investments, available-for-sale	511,092	726,923
Accounts receivable, net of allowances of $4,048 and $5,883 at June 30, 2017 and December 31, 2016, respectively	541,315	681,206
Inventories, net	13,229	12,522
Prepaid expenses and other current assets	176,080	124,842
Current assets of discontinued operations	0	179,689
Total current assets	2,086,487	2,561,277
Long-term investments, available-for-sale	1,045,384	980,142
Property and equipment, net	252,925	261,954
Goodwill	1,617,105	1,585,893
Other intangible assets, net	187,550	173,681
Deferred tax assets, net	177,375	233,900
Other assets	64,083	54,449
Long-term assets of discontinued operations	0	538,931
Total assets	5,430,909	6,390,227
Current liabilities:
Accounts payable	65,265	72,724
Accrued expenses and other current liabilities	240,808	256,799
Income taxes payable	4,724	39,771
Current portion of deferred revenues	1,205,692	1,208,229
Short-term debt	30,000	0
Convertible notes, short-term	0	1,348,156
Current liabilities of discontinued operations	0	172,670
Total current liabilities	1,546,489	3,098,349
Long-term portion of deferred revenues	510,209	476,135
Convertible notes, long-term	1,367,092	0
Other liabilities	125,418	119,813
Long-term liabilities of discontinued operations	0	7,708
Commitments and contingencies
Temporary equity from Convertible notes	0	79,495
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; 304,891 and 302,851 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	305	303
Additional paid-in capital	4,922,187	4,761,588
Retained earnings	3,663,732	4,010,737
Accumulated other comprehensive loss	(8,779)	(28,704)
Stockholders' equity before treasury stock	8,577,445	8,743,924
Less - common stock in treasury, at cost (153,687 and 146,552 shares at June 30, 2017 and December 31, 2016, respectively)	(6,695,744)	(6,135,197)
Total stockholders' equity	1,881,701	2,608,727
Total liabilities, temporary equity and stockholders' equity	$ 5,430,909	$ 6,390,227

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.