Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 53,331	$ 49,650
Marketable investments (Note 3)	47,775	54,885
Accounts receivable, net (Note 11)	67,355	67,429
Deferred commissions	13,529	13,754
Prepaid expenses and other current assets	15,737	22,277
Total current assets	197,727	207,995
Property and equipment, net (Note 11)	27,569	32,174
Goodwill (Note 2)	74,071	76,683
Intangible assets, net (Note 2)	2,334	3,382
Other assets	17,290	12,473
Total assets	318,991	332,707
Current Liabilities:
Accounts payable	525	912
Accrued expenses and other current liabilities (Note 11)	41,252	36,217
Deferred revenue	140,676	144,568
Total current liabilities	182,453	181,697
Non-current liabilities (Note 11)	9,236	9,408
Total liabilities	$ 191,689	$ 191,105
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 - 21,063 and 20,856 shares as of December 31, 2015 and 2014, respectively Outstanding 17,752 and 18,153 shares as of December 31, 2015 and 2014, respectively	$ 211	$ 209
Additional paid-in capital	134,967	124,942
Retained earnings	117,135	117,318
Treasury stock - 3,311 and 2,703 shares as of December 31, 2015 and 2014, respectively, at cost	(120,185)	(99,254)
Accumulated other comprehensive loss	(4,826)	(1,613)
Total stockholders’ equity	127,302	141,602
Total liabilities and stockholders’ equity	$ 318,991	$ 332,707