Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 907,977	$ 836,095
Short-term investments, available-for-sale	506,118	726,923
Accounts receivable, net of allowances of $5,435 and $5,883 at March 31, 2017 and December 31, 2016, respectively	485,769	681,206
Inventories, net	15,210	12,522
Prepaid expenses and other current assets	170,083	124,842
Current assets of discontinued operations	0	179,689
Total current assets	2,085,157	2,561,277
Long-term investments, available-for-sale	952,157	980,142
Property and equipment, net	260,149	261,954
Goodwill	1,616,817	1,585,893
Other intangible assets, net	199,339	173,681
Deferred tax assets, net	184,208	233,900
Other assets	62,739	54,449
Long-term assets of discontinued operations	0	538,931
Total assets	5,360,566	6,390,227
Current liabilities:
Accounts payable	64,075	72,724
Accrued expenses and other current liabilities	255,013	256,799
Income taxes payable	28,188	39,771
Current portion of deferred revenues	1,169,891	1,208,229
Short-term debt	100,000	0
Convertible notes, short-term	0	1,348,156
Current liabilities of discontinued operations	13,820	172,670
Total current liabilities	1,630,987	3,098,349
Long-term portion of deferred revenues	493,862	476,135
Convertible notes, long-term	1,357,580	0
Other liabilities	144,395	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; 304,775 and 302,851 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	305	303
Additional paid-in capital	4,882,838	4,761,588
Retained earnings	3,553,680	4,010,737
Accumulated other comprehensive loss	(10,934)	(28,704)
Stockholders' equity before treasury stock	8,425,889	8,743,924
Less - common stock in treasury, at cost (153,643 and 146,552 shares at March 31, 2017 and December 31, 2016, respectively)	(6,692,147)	(6,135,197)
Total stockholders' equity	1,733,742	2,608,727
Total liabilities, temporary equity and stockholders' equity	$ 5,360,566	$ 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).

Name:	us-gaap_AccountsPayableCurrent
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.