Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 45,586	$ 49,650
Marketable investments (Note 3)	58,565	54,885
Accounts receivable, net	37,379	67,429
Deferred commissions	9,332	13,754
Prepaid expenses and other current assets	21,154	22,277
Total current assets	172,016	207,995
Property and equipment, net	27,781	32,174
Goodwill	74,772	76,683
Intangible assets, net	2,591	3,382
Other assets	15,540	12,473
Total assets	292,700	332,707
Current Liabilities:
Accounts payable	595	912
Accrued expenses and other current liabilities	29,641	36,217
Deferred revenue	124,195	144,568
Total current liabilities	154,431	181,697
Non-current liabilities	9,277	9,408
Total liabilities	$ 163,708	$ 191,105
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 - 21,046 and 20,856 as of September 30, 2015 and December 31, 2014, respectively Outstanding 17,808 and 18,153 as of September 30, 2015 and December 31, 2014, respectively	$ 210	$ 209
Additional paid-in capital	132,172	124,942
Retained earnings	118,131	117,318
Treasury stock - 3,238 and 2,703 as of September 30, 2015 and December 31, 2014, respectively, at cost	(117,893)	(99,254)
Accumulated other comprehensive loss	(3,628)	(1,613)
Total stockholders’ equity	128,992	141,602
Total liabilities and stockholders’ equity	$ 292,700	$ 332,707