Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 74,176	$ 76,958
Marketable investments (Note 3)	60,417	61,147
Accounts receivable, net	55,029	58,812
Deferred commissions	12,287	12,052
Prepaid expenses and other current assets	14,312	14,467
Total current assets	216,221	223,436
Property and equipment, net	23,413	23,894
Goodwill	73,552	73,193
Intangible assets, net	1,280	1,464
Other assets	13,336	13,798
Total assets	327,802	335,785
Current Liabilities:
Accounts payable	328	1,806
Accrued expenses and other current liabilities	29,779	41,403
Deferred revenue	156,256	134,265
Total current liabilities	186,363	177,474
Non-current liabilities	8,188	8,275
Total liabilities	194,551	185,749
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 - 21,809 and 21,719 shares as of March 31, 2017 and December 31, 2016, respectively Outstanding - 17,883 and 18,361 shares as of March 31, 2017 and December 31, 2016, respectively	218	217
Additional paid-in capital	162,159	157,569
Retained earnings	121,069	121,799
Treasury stock - 3,926 and 3,358 shares as of March 31, 2017 and December 31, 2016, respectively, at cost	(143,429)	(121,976)
Accumulated other comprehensive loss	(6,766)	(7,573)
Total stockholders’ equity	133,251	150,036
Total liabilities and stockholders’ equity	$ 327,802	$ 335,785