Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 76,958	$ 53,331
Marketable investments (Note 3)	61,147	47,775
Accounts receivable, net (Note 11)	58,812	67,355
Deferred commissions	12,052	13,529
Prepaid expenses and other current assets	14,467	15,737
Total current assets	223,436	197,727
Property and equipment, net (Note 11)	23,894	27,569
Goodwill (Note 2)	73,193	74,071
Intangible assets, net (Note 2)	1,464	2,334
Other assets	13,798	17,290
Total assets	335,785	318,991
Current Liabilities:
Accounts payable	1,806	525
Accrued expenses and other current liabilities (Note 11)	41,403	41,252
Deferred revenue	134,265	140,676
Total current liabilities	177,474	182,453
Non-current liabilities	8,275	9,236
Total liabilities	185,749	191,689
Commitments (Note 6)
Stockholders' Equity (Note 7):
Preferred stock, $0.01 par value Authorized - 500 shares, issued and outstanding - none
Common stock, $0.01 par value Authorized - 125,000 shares Issued - 21,719 and 21,063 shares as of December 31, 2016 and 2015, respectively Outstanding 18,361 and 17,752 shares as of December 31, 2016 and 2015, respectively	217	211
Additional paid-in capital	157,569	134,967
Retained earnings	121,799	117,135
Treasury stock -3,358 and 3,311 shares as of December 31, 2016 and 2015, respectively, at cost	(121,976)	(120,185)
Accumulated other comprehensive loss	(7,573)	(4,826)
Total stockholders’ equity	150,036	127,302
Total liabilities and stockholders’ equity	$ 335,785	$ 318,991

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.