INTERIM CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 7,539	$ 18,422
Short term bank deposits	39,354	47,229
Marketable securities	79,273	69,343
Trade receivables	9,186	6,232
Deferred tax assets	2,565	2,065
Prepaid expenses and other current assets	3,071	2,361
Total current assets	140,988	145,652
Long term bank deposits	28,226	23,050
Severance pay fund	6,615	6,130
Deferred tax assets	1,305	1,178
Property and equipment, net	1,707	1,392
Goodwill	36,498	36,498
Investments in other companies	2,733	2,433
Total long-term assets	77,084	70,681
Total assets	218,072	216,333
Current liabilities:
Trade payables	1,198	1,176
Deferred revenues	539	865
Accrued expenses and other payables	2,595	3,462
Accrued payroll and related benefits	6,411	6,978
Income taxes payable, net	2,127	1,626
Total current liabilities	12,870	14,107
Long term liabilities:
Accrued severance pay	6,722	6,158
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; 23,595,160 shares issued both at June 30, 2013 and December 31, 2012, and 22,038,307 and 22,187,367 shares outstanding at June 30, 2013 and December 31, 2012, respectively	22	22
Additional paid in-capital	201,159	198,495
Treasury stock at cost (1,556,853 and 1,407,793 shares of common stock at June 30, 2013 and December 31, 2012, respectively)	(27,737)	(25,694)
Accumulated other comprehensive income (loss)	(367)	360
Retained earnings	25,403	22,885
Total stockholders' equity	198,480	196,068
Total liabilities and stockholders' equity	$ 218,072	$ 216,333