Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 49,650	$ 74,132
Marketable investments (Note 3)	54,885	81,013
Accounts receivable, net (Note 11)	67,429	77,543
Deferred commissions	13,754	12,939
Prepaid expenses and other current assets	22,277	20,762
Total current assets	207,995	266,389
Property and equipment, net (Note 11)	32,174	39,868
Goodwill (Note 2)	76,683	80,001
Intangible assets, net (Note 2)	3,382	5,777
Other assets	12,473	10,167
Total assets	332,707	402,202
Current Liabilities:
Accounts payable	912	1,024
Accrued expenses and other current liabilities (Note 11)	36,217	33,471
Deferred revenue	144,568	152,903
Total current liabilities	181,697	187,398
Non-current liabilities (Note 11)	9,408	10,142
Total liabilities	191,105	197,540
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 - 20,856 and 20,491 in 2014 and 2013, respectively Outstanding 18,153 and 19,756 in 2014 and 2013, respectively	209	205
Additional paid-in capital	124,942	109,676
Retained earnings	117,318	118,415
Treasury stock - 2,703 and 735 in 2014 and 2013, respectively, at cost	(99,254)	(26,088)
Accumulated other comprehensive income (loss)	(1,613)	2,454
Total stockholders' equity	141,602	204,662
Total liabilities and stockholders' equity	$ 332,707	$ 402,202