Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 83,185	$ 86,927
Marketable investments (Note 4)	135,114	119,990
Accounts receivable, net	47,714	73,574
Deferred income taxes	3,925	4,089
Deferred commissions	10,765	12,598
Prepaid expenses and other current assets	17,804	16,733
Restricted cash	2,342	3,879
Total current assets	300,849	317,790
Long-term marketable securities (Note 4)	9,259	9,117
Restricted cash	1,971	11,609
Property and equipment, net	43,090	19,838
Deferred income taxes	6,656	7,779
Goodwill	71,961	67,958
Intangible assets, net	12,099	8,487
Non-marketable investments (Note 5)	7,726	7,359
Other assets	573	540
Total assets	454,184	450,477
Current Liabilities:
Accounts payable	2,743	3,644
Accrued expenses	31,266	36,485
Deferred revenue	130,356	131,521
Total current liabilities	164,365	171,650
Non-current liabilities	11,492	6,920
Total liabilities	175,857	178,570
Stockholders' Equity (Note 8):
Preferred stock, $.01 par value; Authorized - 500 shares, issued and outstanding - 0	0	0
Common stock, $.01 par value; Authorized - 125,000 shares; Issued - 30,746 and 30,500 as of June 30, 2011 and December 31, 2010, respectively; Outstanding - 22,687 and 22,812 as of June 30, 2011 and December 31, 2010, respectively	307	305
Additional paid-in capital	366,354	358,017
Retained earnings	90,033	81,652
Treasury stock - 8,059 and 7,688 as of June 30, 2011 and December 31, 2010, respectively, at cost	(175,990)	(162,595)
Accumulated other comprehensive loss	(2,377)	(5,472)
Total stockholders' equity	278,327	271,907
Total liabilities and stockholders' equity	$ 454,184	$ 450,477