Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 68,856	$ 53,331
Marketable investments (Note 3)	57,673	47,775
Accounts receivable, net	42,714	67,355
Deferred commissions	11,576	13,529
Prepaid expenses and other current assets	14,208	15,737
Total current assets	195,027	197,727
Property and equipment, net	25,833	27,569
Goodwill	74,444	74,071
Intangible assets, net	1,933	2,334
Other assets	18,837	17,290
Total assets	316,074	318,991
Current Liabilities:
Accounts payable	694	525
Accrued expenses and other current liabilities	30,648	41,252
Deferred revenue	138,597	140,676
Total current liabilities	169,939	182,453
Non-current liabilities	9,436	9,236
Total liabilities	179,375	191,689
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 - 21,258 and 21,063 shares as of June 30, 2016 and December 31, 2015, respectively Outstanding 17,947 and 17,752 shares as of June 30, 2016 and December 31, 2015, respectively	213	211
Additional paid-in capital	141,869	134,967
Retained earnings	119,456	117,135
Treasury stock - 3,311 shares as of June 30, 2016 and December 31, 2015, at cost	(120,185)	(120,185)
Accumulated other comprehensive loss	(4,654)	(4,826)
Total stockholders’ equity	136,699	127,302
Total liabilities and stockholders’ equity	$ 316,074	$ 318,991