Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 67,106	$ 76,958
Marketable investments (Note 3)	58,129	61,147
Accounts receivable, net	50,954	58,812
Deferred commissions	10,578	12,052
Prepaid expenses and other current assets	13,223	14,467
Total current assets	199,990	223,436
Property and equipment, net	24,439	23,894
Goodwill	75,024	73,193
Intangible assets, net	1,109	1,464
Other assets	13,631	13,798
Total assets	314,193	335,785
Current Liabilities:
Accounts payable	1,080	1,806
Accrued expenses and other current liabilities	32,349	41,403
Deferred revenue	145,350	134,265
Total current liabilities	178,779	177,474
Non-current liabilities	8,040	8,275
Total liabilities	186,819	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 - 21,914 and 21,719 shares as of June 30, 2017 and December 31, 2016, respectively Outstanding - 17,612 and 18,361 shares as of June 30, 2017 and December 31, 2016, respectively	219	217
Additional paid-in capital	166,022	157,569
Retained earnings	123,780	121,799
Treasury stock - 4,302 and 3,358 shares as of June 30, 2017 and December 31, 2016, respectively, at cost	(158,402)	(121,976)
Accumulated other comprehensive loss	(4,245)	(7,573)
Total stockholders’ equity	127,374	150,036
Total liabilities and stockholders’ equity	$ 314,193	$ 335,785