Discontinued Operations (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations
Income/(loss) from discontinued operations, net of taxes	$ 265,000	$ (18,040,000)	$ (4,616,000)
Equities division
Discontinued Operations
Gain or loss recognized from discontinued operations	0
Net revenues	54,000	13,064,000	22,302,000
Total expenses (excluding interest)	(349,000)	38,808,000	30,137,000
Income/(loss) from discontinued operations before income taxes	403,000	(25,744,000)	(7,835,000)
Income tax expense/(benefit)	138,000	(7,704,000)	(3,219,000)
Income/(loss) from discontinued operations, net of taxes	265,000	(18,040,000)	(4,616,000)
Goodwill and intangible impairment charge		14,300,000
Restructuring expense	$ 447,000	$ (7,094,000)