Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Allowance for accounts receivable	$ 402	$ 1,086
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	4,855,000	4,855,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Treasury stock, shares	1,360,711	1,541,739
Series A Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	110,000	110,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common Stock Voting
Common stock, par value	$ 0.003	$ 0.003
Common stock, shares authorized	110,000,000	110,000,000
Common stock, shares issued	37,859,623	37,725,394
Common stock, shares outstanding	36,498,912	36,183,655
Common Stock Non-Voting
Common stock, par value	$ 0.003	$ 0.003
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued
Common stock, shares outstanding	2,585,654	2,585,654