Interim Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Jan. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 20,507		$ 14,954
Short term bank deposits	61,610		55,431
Marketable securities (see Note 3)	54,531		69,027
Trade receivables (net of allowance for doubtful accounts of $25 at both June 30, 2012 and December 31, 2011)	4,702		5,116
Deferred tax assets	2,015		2,248
Prepaid expenses and other accounts receivable	2,468		2,320
Total current assets	145,833		149,096
Long term bank deposit	19,321		25,106
Severance pay fund	5,645		5,473
Deferred tax assets	1,063		832
Property and equipment, net	1,177		1,235
Goodwill	36,498		36,498
Investment in other company	900		900
Total long-term assets	64,604		70,044
Total assets	210,437		219,140
Current liabilities:
Trade payables	1,006		580
Deferred revenues	1,032		1,074
Accrued expenses and other payables	8,077		10,124
Income taxes payable, net	1,542		545
Deferred tax liabilities	94		290
Total current liabilities	11,751		12,613
Long term liabilities:
Accrued severance pay	5,697		5,607
Stockholders' equity:
Preferred Stock: $0.001 par value; 5,000,000 shares authorized; none issued and outstanding
Common Stock: $0.001 par value: 60,000,000 shares authorized; 22,538,937 and 23,543,746 shares issued and outstanding at June 30, 2012 and December 31, 2011, respectively	23		24
Additional paid in-capital	195,814		191,945
Treasury stock	(20,556)
Accumulated other comprehensive loss	(324)		(901)
Retained earnings	18,032		9,852
Total stockholders' equity	192,989		200,920
Total liabilities and stockholders' equity	$ 210,437		$ 219,140